Ok this is what I did . I replaced the flexplate on the wifes 2000 xj. The new one matched up with the old . Fired it up after I was done and the engine chugs and won't stay running , my first thought was the cps and changed that out but there was no change. It sounds like a timing issue but it has the coil pack. This is a 2000 xj with a 4.0 and auto trans .Anyone have any ideas that would help Thanks