Before I retired in 2011 I would work on these problems alot and this is one I would be using the Co-Pilot on as it can record the electronics when it acts up. Either the dealer can drive it with it on or they can let you take it as you just have to press a button when it acts up. This tool works awesome on problems like yours when they wont act up in the shop. Most of my years were with Dodge and I do remember on the Dodge trucks we had trouble with the dist (cam sensor) pick-up wires rubbing on the back of the drivers valve cover and shorting at times. I dont remember if the Jeep harness runs the same but you may want to check it. If you know a good Mopar tech you might want to ask him if they can use the Co-pilot on it as it usually takes any guess out of it. Ron