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frank1 · 10-26-2008, 09:13 AM

check your egr valve for carbon build up. the egr valve should be closed at idle. the carbon will not let it seat all the way closed and it won't set a code. Just had the same problem with my 2000 k2500 5.7. good luck. Frank

10-26-2008, 09:13 AM	#89
frank1 Registered User Join Date: Oct 2008 Location: massachusetts Age: 51 Posts: 6	Re: 1991 chevy 1500 5.7 tbi erratic idle check your egr valve for carbon build up. the egr valve should be closed at idle. the carbon will not let it seat all the way closed and it won't set a code. Just had the same problem with my 2000 k2500 5.7. good luck. Frank