Mechanics

GMC SIERRA IDLE AIR CONTROL VALVE PROBLEM

1984 GMC Sierra • 4,000 miles

The idle is high and I've check for vacuum leak but it was fine. What else can it be
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Wehrwein
February 5, 2013.



Do you have a carb on the vehicle or is it fuel injected? If fuel injected, check the idle air control valve. If it has a carb, you can adjust curb idle speed on the carb itself.