I have a pair of Jeep Wranglers, 05 and 98. The 98 recently blew up its CAT after a fairly long trip. Replaced it and fixed a small crack on the exhaust manifold. It ran like an unbalanced washing machine. Replaced the obvious 6 sensors plus plugs and wires, still nothing. Took it to the dealer who swapped out the computer, distributor, and a few more sensors, nothing. They didn't like the look of the flywheel so they replaced it, nothing. The pulled the valve cover and saw a broken spring, replaced, and nothing. Pulled the head off saw some ugly stuff, machine shoped it, nothing. I am going to pucik it up tomorrow and planned to continue down the path of the broken spring by pulling the cam, then I read this and don't know who is right. I hope you will restart the discussion/fight for me?