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shuddering at high speed

  1. JK Tech Forum
    Long time lurker, first time poster. 2013 JKU SPORT 52k miles Bought this car about 9 months ago, & love it. 6 months ago we had to change out the spark plugs as cylinder 5 threw a misfire code. We did not change the coil packs. Gaskets looked good. When spark plugs were pulled there was a...