VEHICLE DOWNSHIFTS HARD IN SLOW TRAFFIC. VEHICLE THEN PROCEEDS TO TURN OFF BUT ENGINE WILL NOT STOP UNTIL YOU PUT FOOT ON BRAKE PUT VEHICLE IN PARK AND PUSH ENGINE BUTTON. THE DEALERSHIP RESETS CODE AND RUNS GOOD FOR ABOUT 200 TO 400 MILES AND HAPPENS AGAIN. BEEN BACK TO DEALERSHIP THREE TIMES. THE TRANSMISSION SHIFTS JERKY BETWEEN 30 TO 37 MPH AND THEN ENGINE LIGHT COMES ON AND VEHILCE STOPS.