Question about 1990 GMC Sierra

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Adjust idle screw on 1990 gmc

Idle adqustment

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Posted on Jan 02, 2017

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SOURCE: how do you set the idle speed on a 1990 GMC

Idle speed for this model is non adjustable

Posted on Apr 30, 2010

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SOURCE: I have a problem with

there is no carb, and no adjustment. if it idles too high, there is a vacuum leak, so check the large hose going from the base of the throttle body to the valve cover. if thats OK, these are known to have a leak at the base gasket, usually at the rear of the throttle body. spray carb cleaner around the base and see if the idle changes, if it does, replace the base gasket.

Posted on Dec 05, 2010

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