Tl*the contact owns a 2005 ford freestar. while driving various speeds, the vehicle does not go into gear and the rpm's go up and down. when driving more than 15 mph, the vehicle begins to jerk. when driving more than 20 mph, the interior lighting illuminates and the vehicle stalls. the vehicle was towed to an auto body shop, but they could not locate the cause of the failure after approximately four diagnostic tests. currently, the vehicle is still at the repair shop. the first three repairs were at the contact's expense, but the failure still persists. the failure mileage was 20,710 and current mileage was 20,986. updated 05/05/09 *bf updated 05/06/09*jb