Mechanics

RUNNING ROUGH AT IDLE

2003 Cadillac Deville

Engine Mechanical problem
2003 Cadillac Deville V8 Front Wheel Drive Automatic 93000 miles

My car is running ok while driving, but at a stop(in drive, neutral, or park) the rpm's drop and surge and at times almost feels as if it will stall. The check engine light came on and the codes stated that both banks were running too lean.

To date I have replaced, mass air flow sensor, fuel filter, all fluids, fuel injector cleaner, and have searched for vacuum leaks finding none.

Any help would be appreciated.

Thanks
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03 Deville
October 23, 2010.



Lean fuel condition could be caused by one of the following below: 1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.

Rasmataz
Oct 23, 2010.