Mine had the same problem at 114k. It was the number 2 &4 cylinders. Very common problem in the 3.6. Chrysler opened a case and covered most of the expense. They installed a new head. Now have 395,000 on it. Still going forward. Down side is just getting the parts when needed. Brake calipers took week to get. Alt, new radiator, etc. took week to get. Very little after market parts available. Called on the radiator fan and they have 330 on back order. Found one at a dealer but only if I let them install it. They won’t just sell it to me. Cuz they is like gold.