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It's a 3.8L. It started off with cylinder #3 but now it's numerous cylinders. They did conduct test you mentioned. They claim that every time the light comes on it is resetting itself so they are unable to verify the issue. They also tested the EGR valve aswell with no issues showing......

I own a 2010 JK Unlimited w/36k miles. It has been at the dealership now for 19 days due to numerous misfire codes during diagnostic testing. The dealership stated they cannot determine what the problem is and are starting a Chrysler "Star" case. Has anyone he'd this issue before and also has...