Lacks power power good on start then decreases

• Check Engine Lightflashing
• Rough running, hesitation, and/or jerking when accelerating
• In most cases, there are no adverse conditions noticed by the driver
• In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy

OBD diagnostic tool

DOES THIS ENGINE HAVE A MASS AIR FLOW SENSOR ? HAY, I KNOW A GUY @ ALLEXPERTS.COM , ROLAND FINSTON, MASTER TECH, HE'LL KNOW REAL QUICK ! GUARANTEED !!!!!!!!

catalytic converters may be clogged up

Have the fuel pressure tested. Also do you have a Check Engine light on?

check the wiring harness and connectors to the boost sensor, if sensor is not reading the truck drops into safe mode, and drastically decreases engine power. the sensor is located on the intake manifold.

HI. There are some areas that will need to be checked for faults, in this case. Check the following:

1. Fuel filter- If this device is clogged, or faulty, it will decrease the flow of fuel to the injector assembly. If the filter hasn't been changed recently, this will be a good place to start.

2. Fuel pump- This device may be weak, or grounded poorly. check the ground, and all wires the link the pump to the power source. replace any corroded contacts and connectors. wires,as well, if needed.

3. Fuel pressure regulator- The fuel pressure regulator is used to keep the fuel pressure in the fuel rail consistent and change the fuel pressure depending on the throttle position. The fuel rail is in a fuel loop between the fuel pump feed and return lines. Because the fuel delivery requirements change depending on the engine's throttle position and engine loads, the fuel injection system must be able to adapt to meet the fuel requirements of the engine's operating conditions during idle, acceleration and steady cruising.The fuel pressure regulator has a small vacuum line attached to it that allows the pressure regulator to change the fuel pressure in the fuel loop depending upon the intake manifold pressure which changes as the throttle position changes. When the throttle is opened, the manifold vacuum pressure drops off, causing the pressure regulator to increase the fuel pressure in the fuel loop, which increases the amount of fuel delivery at the injectors to provide for the additional fuel needed for the engine to operate properly.At idle, the manifold vacuum increases and the demands for the rate of fuel delivery are decreased so the pressure regulator decreases the fuel pressure in the fuel loop.

1. Look for visible evidence of fuel leaks.
2. A pressure regulator can become defective due to foreign material or a ruined diaphragm.

The result will be hard starting, poor idle quality, and lack or power. Burned spark plugs can result from operating with a lean air/fuel mixture, as well. replace this device if faults exist.

Confirm ur fuel pump is working. Ensure ur pickup tube is not blocked. Then ensure u did not leave a rag or parts in the manifold tubes. Not laughing it happens. Is the distributor in the right spot. Etc etc. Did u rehook the alt up if removed . Is tje battery fully charged. And lastly is the fuel flowing and freash. Then recheck your work did u replace all parts right. Any air in the head gasket will make the fuel /air mixture off.
Good luck

hi check and make sure that your clutch fan is not seased up and any of your pullies as well,and check for good exhaust flow unhook cat convertor then take for drive and see if it has power

bad injectors

Hi

There is a good chance (amongst other things) that the EGR valve is stuck open. It can easily be removed and cleaned.

However, the engine management light is the way forward. Have a code read done and it will point you in the right direction.

Regards

Geordie