Question about 1990 GMC Sierra
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Posted on Jan 02, 2017
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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