Here is a list of probable causes.
LACK OF POWER, SLUGGISH OR SPONGY
Engine delivers less power than expected. Little or no increase in speed when accelerator is pushed down.
Possible Cause & Correction
Check following items:
" Ensure air filter and fuel filter are not plugged. Replace if necessary. Check for incorrect
fuel pressure. Also check for contaminated fuel.
" Check shift solenoid system and TCC system for proper operation.
" Check knock sensor system for excessive retard.
" Check ignition control system for proper operation.
" Ensure EGR valve is not open all the time.
" Check exhaust system for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter.
" Check charging system output. Repair charging system if voltage is less than 9 volts or more than 17 volts.
" Check for A/C clutch cutout at wide open throttle.
" Check MAP sensor.
" Using Spark Tester (ST-125), check for available secondary voltage.
" Check air induction system for restrictions.
" Check engine valve timing and compression.
" Ensure the installed PROM is correct for that particular vehicle. Check with dealer for latest application information.
" Check PCM grounds for clean, tight connections.
" Check for incorrect or worn camshaft.
" Check for excessive fuel additives.
" Check for binding accelerator cable.
" Check distributor vent system (if equipped).
" Check engine supercharger (if equipped).
" Check if engine is operating in power management mode (if equipped).
" Check boost control system components and connections (if equipped).
From symptom descriptoon, I would suggest starting with the EGR system.
Friday, October 8th, 2010 AT 7:48 AM