The Jeep starts to stall, shutters, chugges when hitting a pothole, frost heave or bump in the road. Step on the gas and the engine just about quits or has no power and chugs for several seconds. Been to the dealership and they can't find it. Checked most connections under the hood and under the dash. It seems to be a definate electrical problem. Engine runs great and smooth when there are good road conditions but it's obviously loosing connection somewhere over the bumps. Anyone else?