I just bought my first Jeep last August and I'm already obsessing about it. Im constantly looking on websites for custom parts that I can install on it. It was running really rough for a few weeks. Cyclinder 5 was constantly misfiring. First thing that I did was change the fuel injector but that didn't work. Next I changed the spark plugs, but the problem still wasn't fixed. Finally I changed the whole coil rail and it has been running beautifully ever since. I really like how the Jeep Engines are fairly easy to work on. I can't wait for summer to take the top off!