Question about 1999 Pontiac Grand Am GT

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Cylinder 3 misfire

I have a 99 pontiac grand am i ran the obd 2 on it and it keeps coming up multiple cylinder misfire. i have replaced the spark plugs, the coils, the o2 sensor,fuel injectors,the boots, crankshaft position sensor,catalytic converter,fuel filter,the tps,idle air control and amongst other things can you please help me

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  • workingr Jul 17, 2008

    mine started doing the same thing Saturday, I replaced the plugs, plug boots, coil packs and ignition control module, still misfiring. You get your figured out yet? I think its the computer.

  • Anonymous May 13, 2009

    I have replaced everything you have and still cannot figure out my issue.... My intake manifold gaskets are new as well.

  • Anonymous Mar 15, 2014

    changed plugs,coils,insulaters and injectors , but still runs rough

  • Anonymous Mar 23, 2014

    replaced injectors fuel filter spark plugs have 61 psi fuel press

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Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.

Posted on Jul 24, 2008

  • holva dalmasi
    holva dalmasi Jan 20, 2014

    when you changed the spark plugs to the right ones did it work?

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Wow man! you change a lot of stuff, it ain't better to buy a new car?

Posted on Jun 17, 2008

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