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    accordman's Avatar
    accordman Posts: 13, Reputation: 1
    New Member
    		  
    #1

    Nov 27, 2007, 06:30 PM
    Bucking running rough
    Hey guys it's ben awhile.my question,I have a 2002 chevy trailblazer and it spit out a po303 code #3 cylinder misfire, this truck don't have spark plug wires but it has a coil for each plug.what may cause this . Thanks
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Nov 27, 2007, 06:57 PM
    I would replace the spark plugs first (ACDelco only). If problem persists, replace #3 coil on plug (COP). Disconnect negative battery cable, before beginning work.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #3

    Dec 11, 2007, 07:47 PM
    Good job. COP failure is common. As an aside, I believe worn plugs, with excessive electrode gap, contributes to COP failure.
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