I bought a used 2007 T&C 3.8L about 3 months ago, with 18K miles. Recently, the engine has stooped completely on at least 3 occasions while driving at full speed. I have to pull over to a full stop, put in park, and restart the engine. The car still is under factory warranty. I took it to the dealer I bought from, whothen sentit to the Chrysler dealer. They kept it for several days, drove it under highway conditions for over 50 miles with diagnostic equipment, but could not duplicate the problem. When my wife picked it up, it stopped again as she was leaving the dealer. They have no clue on what the problem might be. Does anyone know what might be causing this problem?