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NEUMANNZZ · 11-20-2008, 01:56 PM

definitely check timing and if it advances with est plugged in.
with the est wire disconnected timing should not be erratic.

also if the engine runs good with the est wire disconnected check the pick up coil. test here:

http://www.autozone.com/az/cds/en_us...rInfoPages.htm

11-20-2008, 01:56 PM	#113
NEUMANNZZ GMC RULZZ Join Date: Mar 2005 Location: San Diego Age: 43 Posts: 9,780	Re: 1991 chevy 1500 5.7 tbi erratic idle definitely check timing and if it advances with est plugged in. with the est wire disconnected timing should not be erratic. also if the engine runs good with the est wire disconnected check the pick up coil. test here: http://www.autozone.com/az/cds/en_us...rInfoPages.htm __________________ O2 GMC RCSB 4.8L V8 AUTO 3.73's rebuilt/beefed up 4L60E(at 43,000miles) Matching Ninja 500r