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  1. J

    2002 LS V8 3.9 running rough only during idle

    I have a 2002 LS V8 with 190,000 miles that is idling rough. I replaced the valve cover gaskets around 100,000 miles and since then have not had any issues with failing COPs. Additionally, I changed out all 8 coils and spark plugs around 150,000 miles. Prior to replacing the valve cover...
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