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Fast idle cycling from 1500 rpm's to 2500 rpm's

(2002 Chevrolet Blazer)
in Flint, MI on March 09, 2013
Had a intake gasket failure and replaced gaskets from the heads up. Started up and idle was so high I was nervous it would over rev. Also have a knocking sound like a exhaust leak at first and then goes away after about 30 seconds of running with the cycling fast idle. Thanks!
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