Did you change or clean the MAF (Mass Air Flow sensor)?
If MAF is bad, the PCM will set it to a default setting, usually rich, which will cause the engine to stall and run rough.
Try cleaning the MAF with a MAF cleaner available at most autoparts stores, (DO NOT TOUCH MAF WIRES).
If problem persists, replace it.
Thursday, April 23rd, 2009 AT 6:39 AM