TL*THE CONTACT OWNS A 2004 JEEP LIBERTY. WHILE IDLING AT A STOP LIGHT IN 4 WHEEL DRIVE, APPROXIMATELY 6 FEET BEHIND ANOTHER VEHICLE, THE VEHICLE DRAMATICALLY JERKED FORWARD WITHOUT WARNING. AS A RESULT, THE CONTACT CRASHED INTO THE OTHER VEHICLE. SHE HAD TO PLACE THE VEHICLE IN PARK TO PREVENT MOVEMENT OF THE VEHICLE. THE DEALER COULD NOT DUPLICATE THE FAILURE. THE CONTACT NOTICED THAT WHEN SWITCHING FROM 4 WHEEL TO TWO WHEEL DRIVE, THE VEHICLE OPERATED AWKWARDLY AS IF IT WAS NOT IN THE PROPER GEAR. THE VEHICLE STALLED ONCE WHILE DRIVING AND THEN RESTARTED ITSELF MOMENTS LATER. THE CONTACT FILED A FORMAL COMPLAINT WITH THE MANUFACTURER. THE CURRENT AND FAILURE MILEAGES WERE 60,000.