I need a lot of help, my yj is having problems. It first started with some misfiring and because it has a little over 90k miles I figured it just needed a tuneup. So I replaced the cap, rotor, plugs, and wires. Ran great for about 3 weeks, then it started missin again, not too bad though. I talked to my buddy and he said its probably the ignition coil maybe even the pick-up coil. I replaced the ignition coil and it ran a little better but when it warmed up it missed hard a couple times and then died. Now its on and off when it wants to start, and when it does I can tell somethings not right. I only have up to the time it warms up to do anything because now its guaranteed to die at that point. I also replaced the pick-up and it did nothing. Everywhere I look its something different. I would like to know what you think it could be and how to check the part, because I really don't like the plug and play method. Thanks for the help.