Thread: 420 code and rough accel.

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  1. #1 Re: 420 code and rough accel. 
    theshznt69
    theshznt69 is offline
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    Default 04-11-2010
    the problem is fixed now i replaced the bad plug and wire im doing all of them next week sorry
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  2. #2 Re: 420 code and rough accel. 
    reallyfast1
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    Default 04-16-2010
    i jsut had the exact same problem!!!! ac delco plugs 1 went bad and had to do them all last night what a pain the as$ the #6 plug is, wires are next!! put NGK 's in this time!
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