Question about 2000 Pontiac Bonneville

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2000 Bonneville runs rough when cold

My 2000 Bonneville runs really rough and misses when I first start it up. After it warms up it seems to run fine. I havent seen the check engine light come on. Any ideas?

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  • jddrake388 Jul 25, 2009

    I am getting p0306 code(no 6 misfire)
    problem gone when warmed up. What do you think I should do first?

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  • 166 Answers

You need to get it scaned.auto zone will do it for free but most of the time it a o2 sensor or coolant sensor

Posted on Jul 17, 2009

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