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SUPERDAD · 09-26-2008, 04:55 AM

Verify fuel pressure and base ignition timing. These are 2 things that are not controlled by the PCM. Have found several TBI idle problems that were caused by these being out of spec.

09-26-2008, 04:55 AM	#6
SUPERDAD Registered User Join Date: May 2008 Location: FLORIDA Age: 48 Posts: 49	Re: 1991 chevy 1500 5.7 tbi erratic idle Verify fuel pressure and base ignition timing. These are 2 things that are not controlled by the PCM. Have found several TBI idle problems that were caused by these being out of spec.