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  1. J

    2000 Explorer with cracked porcelain on a spark plug.

    I have a 2000 explorer with a 4.0 ohv motor. the number 4 cylinder keeps coming up with a misfire code. When the plug is removed the porcelain inside the head is cracked and half of the porcelain is missing. Have changed the plugs and wires the first time and just the plug twice after. Have also...
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