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My GMC 1500 Sierra
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
13 Answers
G A answered 3 years ago
Vortec "spyder" injection system is not the best, you may finally have to replace the system, Have you tried run some SeaFoam in the fuel? See pic.
G A answered 3 years ago
96, 97, 98, 99 That is what it is suppose to have. Has it been modified?
G A answered 3 years ago
So that would make it an 88 they were TBI. So then have you got the codes out of yet?
G A answered 3 years ago
Random multiple, or did it give you a cylinder number?
John answered 3 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
G A answered 3 years ago
Did you check for a bad intake manifold gasket?
John answered 3 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
Your Answer:
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