I have a 08 g5 gt took ti the dealer replaced throttle body and sensor replaced intake and exhaust cmp actuator solenoid replaced maf sensor after 2 days car is missing surging and shutting off

Not without having the vehicle here an doing some testing .
DTC P0016: Crankshaft Position (CKP) - Intake Camshaft Position (CMP) Correlation
DTC P0017: Crankshaft Position (CKP) - Exhaust Camshaft Position (CMP) Correlation

Circuit/System Verification
Note: The scan tool control of the CMP actuator is inhibited when DTC P0016 or P0017 sets.
Command each CMP actuator to 25 percent. The CMP actuator angle desired parameter should match the CMP actuator actual parameter.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note: Incorrect engine oil viscosity, aftermarket engine oil additives, or engine oil that is overdue for changing, can greatly affect the performance of the camshaft actuator.
Ignition OFF, inspect the crankshaft balancer bolt for the proper torque. Refer to Fastener Tightening Specifications.
Remove the CMP actuator solenoid. Refer to Camshaft Position Actuator Solenoid Valve Replacement.
Connect a fused jumper wire between the CMP actuator high control circuit terminal A at the solenoid and B+. Connect a jumper wire to the CMP actuator low reference circuit terminal B at the solenoid. Momentarily touch the jumper wire to ground. Observe the spool valve inside the CMP actuator. The spool valve should move from fully closed to fully opened position.
? If the spool valve inside the CMP actuator solenoid does not move, replace the CMP actuator solenoid.
Inspect the CMP actuator for binding or being stuck.
Inspect the engine for the following conditions:
• An incorrectly installed camshaft sensor
• An incorrectly installed crankshaft sensor
• An incorrectly installed camshaft actuator
• Incorrect valve timing
• A loose camshaft reluctor wheel
• A loose crankshaft reluctor wheel
• Excessive crankshaft end play
Repair Instructions

What engine ? It's a solenoid , usually located in the front of the valve cover , top or side .
Variable Camshaft Timing (VCT) System

The VCT enables rotation of the camshaft(s) relative to the crankshaft rotation as a function of engine operating conditions. There are 4 types of VCT systems.

• Exhaust phase shifting (EPS) system - the exhaust cam is the active cam being retarded.
• Intake phase shifting (IPS) system - the intake cam is the active cam being advanced.
• Dual equal phase shifting (DEPS) system - both intake and exhaust cams are phase shifted and equally advanced or retarded.
• Dual independent phase shifting (DIPS) system - where both the intake and exhaust cams are shifted independently.

All systems have 4 operational modes: idle, part throttle, wide open throttle (WOT), and default mode. At idle and low engine speeds with closed throttle, the powertrain control module (PCM) determines the phase angle based on air flow, engine oil temperature and engine coolant temperature. At part and wide open throttle the PCM determines the phase angle based on engine RPM, load, and throttle position. VCT systems provide reduced emissions and enhanced engine power, fuel economy and idle quality. IPS systems also have the added benefit of improved torque. In addition, some VCT system applications can eliminate the need for an external exhaust gas recirculation (EGR) system. The elimination of the EGR system is accomplished by controlling the overlap time between the intake valve opening and exhaust valve closing. Currently, both the IPS and DEPS systems are used.
Variable Camshaft Timing (VCT) System
The VCT system consists of an electric hydraulic positioning control solenoid, a camshaft position (CMP) sensor, and a trigger wheel. The CMP trigger wheel has a number of equally spaced teeth equal to the number (n) of cylinders on a bank plus one extra tooth (n+1). Four cylinder and V8 engines use a CMP 4+1 tooth trigger wheel. V6 engines use a CMP 3+1 tooth trigger wheel. The extra tooth placed between the equally spaced teeth represents the CMP signal for that bank. A crankshaft position sensor (CKP) provides the PCM with crankshaft positioning information in 10 degree increments.

1. The PCM receives input signals from the intake air temperature (IAT) sensor, engine coolant temperature (ECT) sensor, engine oil temperature (EOT) sensor, CMP, throttle position (TP) sensor, mass air flow (MAF) sensor, and CKP to determine the operating conditions of the engine. At idle and low engine speeds with closed throttle, the PCM controls the camshaft position based on ECT, EOT, IAT, and MAF. During part and wide open throttle, the camshaft position is determined by engine RPM, load and throttle position. The VCT system does not operate until the engine is at normal operating temperature.

1. The VCT system is enabled by the PCM when the correct conditions are met.

1. The CKP signal is used as a reference for CMP positioning.

1. The VCT solenoid valve is an integral part of the VCT system. The solenoid valve controls the flow of engine oil in the VCT actuator assembly. As the PCM controls the duty cycle of the solenoid valve, oil pressure/flow advances or retards the cam timing. Duty cycles near 0% or 100% represent rapid movement of the camshaft. Retaining a fixed camshaft position is accomplished by dithering (oscillating) the solenoid valve duty cycle.
   
   The PCM calculates and determines the desired camshaft position. It continually updates the VCT solenoid duty cycle until the desired position is achieved. A difference between the desired and actual camshaft position represents a position error in the PCM VCT control loop. The PCM disables the VCT and places the camshaft in a default position if a concern is detected. A related DTC is also set when the concern is detected.

1. When the VCT solenoid is energized, engine oil is allowed to flow to the VCT actuator assembly which advances or retards the camshaft timing. One half of the VCT actuator is coupled to the camshaft and the other half is connected to the timing chain. Oil chambers between the 2 halves couple the camshaft to the timing chain. When the flow of oil is shifted from one side of the chamber to the other, the differential change in oil pressure forces the camshaft to rotate in either an advance or retard position depending on the oil flow.

(1) Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1
(2) Camshaft Position (CMP) Sensor - Intake Bank 1
(3) Camshaft Position (CMP) Sensor - Intake Bank 2
(4) Camshaft Position (CMP) Actuator Solenoid - Intake Bank 2
(5) Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2
(6) Camshaft Position (CMP) Sensor - Exhaust Bank 2
(7) Generator
(8) A/C Compressor Clutch
(9) Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 1
(10) Camshaft Position (CMP) Sensor - Exhaust Bank 1

Before you replace a part you may or may not need . Why ? What code ? Does the vehicle run ? There has been a lot of confusion on these vehicles with variable valve timing , mixing up cam sensors with camshaft actuators
DTC P0008: Engine Position System Performance Bank 1

DTC P0009: Engine Position System Performance Bank 2
The presence of DTCs P0008 and P0009 along with P0016, P0017, P0018, and P0019 indicates a possible condition with the primary timing chain and the alignment between both intermediate sprockets and the crankshaft. Or, the crankshaft reluctor wheel has moved and is no longer referenced to top dead center (TDC).

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Observe the scan tool CMP Desired, Actual, and Angle Variance parameters before a DTC sets. This may help to isolate whether a condition is specific to one camshaft, one bank, or caused by a condition with the primary crankshaft timing.

DTC Descriptors
DTC P0010: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 1

DTC P0013: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 1

DTC P0020: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 2

DTC P0023: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Bank 2

DTC P2088: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 1

DTC P2089: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 1

DTC P2090: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 1

DTC P2091: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 1

DTC P2092: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 2

DTC P2093: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 2

DTC P2094: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank 2

DTC P2095: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage Bank 2
DTC P0341: Intake Camshaft Position (CMP) Sensor Performance Bank 1

DTC P0342: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1

DTC P0343: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1

DTC P0346: Intake Camshaft Position (CMP) Sensor Performance Bank 2

DTC P0347: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2

DTC P0348: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2

DTC P0366: Exhaust Camshaft Position (CMP) Sensor Performance Bank 1

DTC P0367: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1

DTC P0368: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1

DTC P0391: Exhaust Camshaft Position (CMP) Sensor Performance Bank 2

DTC P0392: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2

DTC P0393: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2
I'm sorry but when dealing with these problems your best bet is to take your vehicle to a qualified repair shop , I have never see a DIY'ER correct the problem with these , an in the end always end up taking it to the dealer .

Which engine ? This vehicle had option of six different engines , 2.4 , 3.5 , 2.8 , 3.0 , 3.2 , 3.6 And are you picking on the right part ? What code > DTC P0010: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit

DTC P0013: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit
It may not even be a cam sensor problem !
DTC P0340: Intake CMP Sensor Circuit

DTC P0365: Exhaust Camshaft Position (CMP) Sensor Circuit
DTC P0341: Intake Camshaft Position (CMP) Sensor Performance

DTC P0366: Exhaust Camshaft Position (CMP) Sensor Performance
Camshaft Position (CMP) Actuator System
The camshaft position (CMP) actuator system is an electro-hydraulic operated device used for a variety of engine performance and operational enhancements. These enhancements include lower emission output through exhaust gas dilution of the intake charge in the combustion chamber, a broader engine torque range, and improved fuel economy. The CMP actuator system accomplishes this by changing the angle or timing of the camshaft relative to the crankshaft position. The CMP actuator simply allows earlier or later intake and exhaust valve opening during the four stroke engine cycle. The CMP actuator cannot vary the duration of valve opening, or the valve lift.
During engine OFF, engine idling conditions, and engine shutdown, the camshaft actuator is held in the Park position. Internal to the CMP actuator assembly is a return spring and a locking pin. During non-phasing modes of the camshaft, the return spring rotates the camshaft back to the Park position, and the locking pin retains the CMP actuator sprocket to the camshaft


It may

code p 0021 refers to camshaft position sensor (CMP), intake /left /front , bank 2--timing over advanced /system performance ====causes --valve timing---engine mechanical fault -- CMP actuator
change the can shaft actuator , not the position sensor
code p 0175 refers to system too rich---bank 2===causes --intake blocked ---EVAP canister purge valve ---fuel pressure ---EGR system---injector/s HO2S ( heated oxygen sensor in the exhaust manifold before the cat converter bank 2
code p 0345 refers to CMP sensor A bank 2--circuit malfunction===causes wiring ---CMP sensor ECM
check the wiring for breaks
code p 0325 refers to knock sensor ( KS) 1 bank 1---circuit malfunction==== causes wiring---poor connection to KS---KS
code p 0171 refers to system too lean bank 1===causes --intake /exhaust system leak---AIR system---MAF/VAF sensor ---fuel pressure /pump---injector/s ---HO2S in the bank 1 exhaust manifold before the cat converter
find an accredited service center with experience on the vehicle and have it fixed

Most common problem is a failed mass airflow sensor. Remove sensor and carefully inspect the sensor for debris building up on the diode. Another possibility is the egr valve may be partially stuck open. The upper intake manifold is made of plastic. The egr gases enter the intake just behind the throttle body inside the plastic intake. It is pretty common for the hot exhaust gases to burn through the plastic and possibly cause coolant to enter combustion chambers. A restricted catalytic convertor from previous engine misfires will accelerate this due to exhaust gases having no place to escape.

What the dealer told you & what they do, is replace
the entire throttle body for no reason, other than they
can't diagnose their own products & they make money
off you

There are no computers used to diagnose or work on any
motor vehicles
A professional scan tool only sees what the PCM (vehicle
computer) sees & that is where all the problems start

A (TACM) throttle actuator control motor ,is part of the
throttle body & is not replaceable & the whole assy is over
$600.00 plus their unnecessary abuse of labor

All you need is spark plugs that do not have over 60,000
miles on them.
Spray the MAF Sensor with CRC MAF Cleaner & the main
problem you have is solved with spraying the sticking throttle
plate with CRC Throttle Body Cleaner, so it works & you do
not loose throttle position or % & get TACM Codes or
get wacked for a Grand by a dealer, which you should never
be at after the warrantee runs out

Also replace the (2) front O2 Sensors at 100,000 miles

PO-113 Intake Air Temperature (IAT) Sensor 1 Circuit High Output

P-2104 Throttle Actuator Control Sysrem-Forced Idle

P-2111 Throttle Actuator Control System -Stuck Open

Without the vehicle,I won't tell you ,that you need to replace anything

The Throttle Actuator, is similar to Toyotas issuses with the gas peddle

To Diagnose what appears to be multipule issues,you need to check out the gas peddle sensors,the throttle body and the MAF Sensor,which has the AIT ,air intake sensor,part of it.

You could carefully remove the MAF and spray only with -CRC MAF Cleaner. Make sure the throttle plate moves relatively free. If you spray it,again Penzoil Throttle Body Spray or similar product

Most likely,your going to need a professional scan tool and some experience,to work out your problems.