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  1. J

    Backfire / popping noise when started

    Hello to all, On my wife’s 2008 jk 3.8 with 180,000 I had just finished replacement of cracked stock exhaust manifold. Stock was replaced with a set of short headers, while Apart I also changed spark plugs, plug wires (live wires) along with a new Ignition coil( screaming demon) or better know...