i had an intermittent stalling problem, after hitting bump it would feel like it would downshift and the check engine light would come on,,had a code for the IAC,,changed that but didn't solve the problem,,then finally it just shut off and wouldn't restart,,the ASD relay was cycling on/off,,,clicking,,, thought maybe it was fuel pump, checked the CPS sensor that was ok, very frustrating,,put jeep up on jackstands and turned on ignition,relay was clicking away,crawled under neath and started pulling on wires and wire looms going up to the engine,,,,and while i was doing that the clicking STOPPED,,holy s,, traced the wires up and found loose connection on stud on engine underneath 2nd plug from firewall,,tightened up and haven't had any problems since,,,,hope this helps

 

Was it a ground?