Car Throttle Stuck problems of the 1999 Cadillac Deville

The contact owns a 1999 Cadillac Deville. The contact stated that while driving at 20 mph the vehicle accelerated independently. The contact mentioned that the throttle became inoperable. The vehicle was towed to an independent mechanic who stated that the throttle body became stuck. The dealer was not notified. The manufacturer was made aware of the failure who did not offer any assistance. The failure and the current mileage was 138,000.