One problem related to car throttle stuck has been reported for the 2001 Lexus RX300. The most recently reported issues are listed below.
Throttle stuck wide open following routine acceleration going up hill. Engine continued at high revs. Control and braking were difficult as engine raced uncontrollably. Vehicle stopped by exiting into parking lot and being put in park. After 1 hour when vehicle restarted engine immediately red lined. It did the same the following day and at dealer after being towed in. Diagnosis from dealer- throttle control body stuck. Fortunately driver dealt with potentially fatal situation without injury or damage. Manufacturer unwilling to disclose similar episodes.