rough idle, loss of power in gear and cruising

Asked by Charles Jun 28, 2015 at 04:57 PM about the 1995 Chevrolet Chevy Van G20 Extended RWD

Question type: Maintenance & Repair

My G20 van with TBI/EGR/TWC/H02S is idling rough as if a vacuum leak but checked all the lines and no leak. When applied a slight acceleration its hesitant and bucks. When driving at cruising speed it looses power and bucks but runs a little better when accelerating in passing gear. There are no codes in the ECM when checked with a code reader. Checked the EGR and seems to be working it opens at approx. 2000 RPM's and when checked for closing a few weeks ago there was no air blowing through when closed! The solenoid vacuum is irregular sometimes it will go up and immediately drop to 0 and  sometimes it will go up and maintain vacuum but sometimes not respond at all with no vacuum. Can you help with this situation?

1 Answer
64,510

firebird338 answered 8 years ago

Check air filter and clean throttle body with throttle body cleaner spray also change fuel filter if have not done done so in a while. Add fuel injector cleaner to gas tank then take out on road and hit the passing gear a few times that will help the injector cleaner to clean the injectors and remove carbon build up.

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