Question about 1999 GMC Jimmy
I found the problem and 99 jimmy is running great now. the major problem was the intake manifold gaskets sucking air and causing random misfire codes(bad fuel/air ratio) but also we pulled the distributor as well because from 87-99 the drive gear was made of soft material and sure enough 3 teeth on the dist gear were almost worn right off. We also replaced this with 120$ new rebuilt unit.
Intake gasket kit is approx 100$ and no more than 2 hrs labour and the distributer is real easy to pull and replace once the intakes are off so this is a good time to check dist with little extra labour.
Posted on Nov 05, 2010
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Posted on Jan 02, 2017
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