Question about 1998 GMC Sierra
1998 GMC SILVERADO FIXED AND REPLACED EVERYTHING BUT TRUCK WILL STILL IDLE HIGH
Have you replaced your intake gaskets? this is a problem on these trucks with high milage. to see if your intake is leaking spray it down with Brake cleaner and if it is leakin you will hear a drop in Rpm's
hope this helps
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Posted on May 08, 2009
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Posted on Jan 02, 2017
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