2011 2-wd yukon xl 1500 engine stall. took delivery 7/1/2011. on 7/5/2011, while driving at city speeds, engine stalled (shut off), was able to restart. this happened twice consecutively. did not experience again until 7/14/2011. this time was driving in center lane, 5 lane freeway, during rush hour at posted 65 mph speed. again, engine stalled (shut down). during 3 cycles of stall/shut down/restart, was able to make my way to right lane, drive/coast to exit ramp, exit freeway and enter a retail parking lot without an accident. during process, heard a pop/click to my left in the dashboard. turned off air conditioner, restarted truck and made my way home. during this drive home, the alternator/voltage gauge needle bounced to extreme right for a short period of time, then settled back closer to center. prior to incident, i had noticed same needle occasionally/oddly slight to the left. truck was towed to selling dealership that evening. the following day, the service department ran full diagnostics and reported "nothing wrong with the vehicle/operating normally". there are no "codes" or any "history codes" showing anything abnormal occurred with the vehicle. 7/18/2011 opened case file with gm, but little assistance has been offered by them other than "we called the dealership". truck has been housed at the dealership now for 11 days. we are at a stalemate. our position is the car is not safe to drive. dealership/gm's position is they can find nothing wrong with the vehicle. they have suggested we pick up the vehicle and drive it until the problem occurs again then again have it towed to the dealership. our response is: if we agree to do that, and are lucky enough to again "survive" the occurrence without being involved in an accident, why do they/we believe they will be able to diagnose and repair the problem? we are waiting for someone/anyone to involve the factory for further technical assistance to resolve this problem. *tr