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Any other ideas ?

Nope I didn’t, I used champion brand. You think that could throw a code/misfires?

Hello, I’ve got a 2011 jk, after mild overheating problems, i blew my head gasket. I proceeded to replace both head gaskets, exhaust manifold gaskets, water pump, spark plugs, spark plug cables. I burped the coolant system of air and refilled with coolant fully. After all this my Jeep now does...