How do i clean a throttle body on a 08 chevy silverado v6 4.3l

That's an emissions code. It's sucking in too much air. Start with checking for vacuum leaks, air filter may not be sealed, could be idle air control valve, throttle pos. sensor. Many possibilities. Start with the simple stuff, you usually get it from that. good luck.

Replacing TPS will reset the light but will stay in memory until the computer is reset. For help to change throttle body sensor check out you tube :How To Install Replace Throttle Position Sensor Chevy Silverado GMC Sierra.

Your vehicle has electronic throttle control , position sensors in the accelerator pedal ,position sensors in the throttle body . A REDUCED POWER message is suppose to warn the drive so it takes it to a quaified repair shop ,DEALER !
Cleaned MAF & throttle body & changed crank position sensor. Not just replace parts blindly .
Electronic Throttle Control System Diagnosis Diagnostic Quick Tips Snap on...
Electronic Throttle Control This video shows Toyota , your's works the same .
Over time these position sensors wear .

It shouldn't. The TPS sensor is voltage based on throttle position. If the plugs are bad, you should get a separate cylinder misfire code only. If you are getting a TPS code, it is likely the TPS. Remember too, it is an electronic TPS, so there is a sensor on the accelerator pedal assembly that it talks to. Make sure that's plugged in. What you can do is with the vehicle in the on position (not running) - push the pedal all the way to the floor a few times. Also, clean out the throttle body and ensure there is no gunk preventing the throttle body from opening smoothly and all the way. Good Luck.

the following link will assist you
08 Silverado Clean Throttle Body Yahoo Video Search Results

It is more then likely a wiring problem or Throttle position sensor or the electric motor in the throttle body ! Pt 2 2007 Chevy 2500HD Reduced Engine Power Warning Fault Code P1516... Drive by Wire Function and Diagnostics by Wells

P2118 - Electronic Throttle Control(ETC) system is made of the components throttle body, Throttle Position Sensor(TPS)1&2 and Accelerator Position Sensor(APS) 1&2. The throttle body contains the actuator, the throttle plate and the throttle position sensor (potentiometer), which are integrated in one housing. The actuator consists of a DC motor with a two-stage gear. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. And it provides feedback to the ECM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.

P2119 - associated

P2110 - A bulletin provides the procedure to clean the Electronic Throttle Control (ETC)
throttle body of Theta-2.0L/2.4L engine equipped vehicles. If a vehicle exhibits the
condition(s) listed below and deposits are found at the valve-to-bore interface inside the
ETC throttle body, clean the throttle body using the procedure described in this bulletin.

This throttle body cleaning procedure should be performed when diagnosing
the conditions listed below. Do not replace the throttle body prior to performing
this procedure.

Any of the following conditions may be caused by throttle body deposits:
• No start (due to throttle valve stuck closed or air flow signifcantly restricted)
• Rough idle or fluctuating engine speed at idle (due to air flow restriction)
• MIL "On" with DTC P2118 or P2119 occurring along with P2110:
• P2118: Throttle Actuator Control Motor Current Range/Performance
• P2119: Throttle Actuator Control Throttle Body Range/Performance
• P2110: Throttle Actuator Control System-Forced Limited Power

It seems CLEAR you have a STICKING butterfly plate in the throttle body.

I am having the same issues on my Chevy 03 HD 1500. It takes at least two turns of the ignition to get it going. I have replaced the battery, Fuel Filter, Fuel Engine Relay and I am now Replacing the Starter Engine Relay. If you have any other suggestions let me know! I will share as well. Also, last couple of days Oil Pressure Gauge is acting strange. It will read from 1/4 point to 3/4 point while driving. Working on that as well.

you should change the tps( throtal position sensor) this can cause that problem

you need to have the codes retrieved and see if you have a code for the throttle module or pedal position sensor, a common problem is the module on the throttle body, which requires throttle body replacement.