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Re: 1991 chevy 1500 5.7 tbi erratic idle
just spray out the iac/passages with carb spray, engine off.
same with egr cleaning. to test egr. remove vacuum line and plug the line. run engine to see if theres an improvement.
what happens when you disconnect the est bypass wire?
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 O2 GMC RCSB 4.8L V8 AUTO 3.73's
rebuilt/beefed up 4L60E(at 43,000miles)
 Matching Ninja 500r
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