You should scan your car for codes, and take a look at your STFT and LTFT.
Also, when was the last time you: Put a new air filter? Change your spark plugs and wires (it did the trick for my wife's impala)?
Make sure your exhaust is not plugged
Other suggestions:
PCV valve
Coolant sensor
Fuel pressure regulator
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Wednesday, September 16th, 2009 AT 4:45 PM