Question about 2003 Pontiac Sunfire

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1998 Sunfire rough running (missfire) common causes?

I am attempting a general tune-up on a 1998 Pontiac Sunfire that has a minor missfire that causes rough idle. I have installed new plugs and wires. Still missing. Any further suggestions?

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  • Anonymous Mar 16, 2014

    at an idle it has missfire

  • Anonymous Mar 31, 2014

    Did head gasket now it idles rough. Everything is in the right order...

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2 Answers

Check the coils my 98 had a crack coil that drove me nuts. If thats the problem make sure you replace both ignition coils

Posted on Jun 18, 2008

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If check engine light comes on may be crank position sensor or ur injectors r clogged try some chevron injector cleanor it helps when injectors clogged makes it run smoother

Posted on Jun 16, 2008

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