Question about 1998 GMC Suburban

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I have a 1998 gmc suburban and it is misfire on cyclinder 4 and cyclinder 5 what can it be

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IT could be bad spark plug wires or do you have the wires switched?

Posted on Sep 14, 2010

  • anigthtressb Sep 14, 2010

    i have new spark plug and new wires and the wires were takeing off one at a time and thin put back on as he take off the old ones he put the new on

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93 gmc jimmy truck has 85% new parts under hood. Misfiring on number #4 new plugs, wires, cap, rotor, all new sensors, fuel injectors cleaned 6 months ago. How to i fix cyclinder #4.


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# 4 cyclinder


Number 4 cylinder is the 2nd cylinder back on the driver side. Check to see if your EGR valve is clogged with carbon. If it is, clean it out and I like to remove the EGR tube from the exhaust to valve and clean it out as well. The EGR tube is a metal tube. Remove the spark plug and see if it's been firing. How long has it been since it's had a set of plugs and wires?

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