Ok little confused here just started this. When you run the jeep hard and it gets hot it devlops a misfire. when you go in somewhere for 10min when its hot it has a misfire for a little... It will go away if you put it to the matt and giver hell. its on cylinder 5 according to my solus scanner. its a 99 xj 4.0 with ford v8 injectors in it. the jeep has 220k on it with a fresh rebuild on it. i was suprised at how clean and still in OEM spec everything was for 215k miles! It just started this and its been in the 30's here so its been quite cool out.... please help its annoying as hell