First check for DTCs and check your sensors readings in the PCM.
Is your engine hesitating or is it misfiring?
You could have:
Dirty fuel injectors
Bad throttle position sensor
Bad or dirty MAF sensor
Low fuel pressure
Vacuum leaks
Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
leaky EGR valve
leaky PCV valve
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Monday, September 8th, 2008 AT 2:44 PM