Question about 1999 GMC Jimmy

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All 6 clinders aren't firing, haveing to pump the gas petal to get it started, once going it runs pretty good but it's getting it going thats the trick. also the timing is all over the place it goes from normal to below normal to way above normal to the point the guy that looked at it didn't know how it was still running back to normal and so on and so forth. any ideas Also the o2sensor it picking it up as to rich and i'm about to blow my new catalidica converter so I have it parked until I find out whats wrong. The guy that looked at it told me to get a $175 compression test and if that came back normal then to put in a new distributor and new spark plugs. is this something normal that happens with jimmys what could be the problem?/

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Sounds like a problem with a worn distributer or with a component attached to the distributer. A distributer shaft moving around with vary the timing and make the vehicle run rich.

Posted on May 29, 2011

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