Question about 1999 GMC Jimmy
Try cleaning the throttle body (throttle body cleanner ONLY). Uncover the TB (engine off) & inspect the butterfly by moving the throttle by hand, if the underside & down inside the TB has a bunch of carbon (black soot) that could hamper with the idle! Also, check the fuel pressure @ the rail, under 60 psi could cause bad idle. Air filter clean? Did you make SURE that the terminals under the spider injector wiring harness has NO pins bent over during connection?! Also could check the throttle possition sensor & the mass air flow sensor if need be.
Posted on Aug 27, 2010
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Posted on Jan 02, 2017
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