Why does my vehicle have an erratic idle it also flutters when driving unless under hard acceleration then runs great
1990 Chevrolet 2500 Pickup

Why does my vehicle have an erratic idle it also flutters when driving unless under hard acceleration then runs great

(1990 Chevrolet C2500)
3 answers & 0 comments
Popular Answer
on May 15, 2015
Suspect EGR valve stuck open....pretty common problem back in the day.. Feel of EGR valve to see if it's really hot... If so its not closing! .. Another way to tell:: unplug one of the injectors on the TBI unit.. If idle smooths out.. Replace the EGR valve!!! .. Now, IF no luck with those test.. Possible failed TBI mounting gasket.. Have you had it scan tested?
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General Diagnosis
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on May 15, 2015
Suspect EGR valve stuck open....pretty common problem back in the day.. Feel of EGR valve to see if it's really hot... If so its not closing! .. Another way to tell:: unplug one of the injectors on the TBI unit.. If idle smooths out.. Replace the EGR valve!!! .. Now, IF no luck with those test.. Possible failed TBI mounting gasket.. Have you had it scan tested?
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of Greg's Orange Auto on May 15, 2015
CLEAN THROTTLE BODY AND SEE IF THAT HELPS
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on May 15, 2015
any vacuum leaks?
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