When driving and coming to a stop below 10mph the truck feels like its racing then I hear a bang and the truck stops. It was stalling after its raced but hasn't stalled in about 2000 miles. Has anybody had this problem? My truck is a 2000ram-2500 4x4 quad cab automatic with 120,000 mile all original equipment. The dealer had it for a week and couldn't duplicate the problem. What should I do next?