1990 GMC Sierra low idle and stalling


Asked by Jun 27, 2015 at 10:13 AM about the 1990 GMC Sierra 1500 K1500 4WD Standard Cab LB

Question type: Maintenance & Repair

I have a 1990 k1500 low idle and
stalling problem, I replaced my fuel
filter and spark plugs, i changed the
fuel pump 3 years ago. Weird thing is
when I rev the engine the oil display
moves with the reving of the engine.
Any insight would be great

3 Answers


Check air filter and clean throttle body with throttle body cleaner. Add fuel injector cleaner to gas tank.


I clean the egr, idle valve, and the carburetor and it's not stalling any more, it is a little rough from idle to 20 mph..


Put in some fuel injector cleaner and take it out on the road and hit the passing gear a few times that will help clean injectors and carbon build up. Be careful no speeding tickets. Did you also check the air filter ?

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