My GMC 1500 Sierra
10

Asked by John Sep 10, 2016 at 04:09 PM about the 1998 GMC Sierra 1500

Question type: Maintenance & Repair

Help !! I have a 1998 GMC Sierra 1500 I have done
everything I can possibly do by changing anything I
can possibly change and it's still misfiring and it is
running so bad is there any suggestions anybody
can get me I would so appreciate it

8 Answers
10

John answered 7 years ago

I just bought a cam shafts positioning sensor I'm going to see if that works if not I don't know what to do LOL

Mark helpful
10

John answered 7 years ago

No I will but would that cause misfiring? I mean I'm going to pull my hair out I've done all I can think of

Mark helpful

GuruH421 answered 7 years ago

The common problem is anti freeze is leak on the inside of the engine onto the spark plug causing a misfire and needs either a head gasket replaced or the gasket and grommets inside of the valve cover under the lifters , either way it needs to be repaired internally.

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