One problem related to accelerator stuck has been reported for the 2003 Lexus ES300. The most recently reported issues are listed below.
I was pulling out of the garage slowly to pause on the driveway to close the garage door and when I step on the gas in reverse the car flew out of the garage and I couldn't stop it with the brakes. There was a small roofing across the street which stopped the car. No one was nearby so no one was hurt. The accelerator seemed stuck for this incident to happen. However, Lexus had an inspector check the car and didn't find anything wrong that showed on the computer so they won't take responsibility for this occurance and they closed the case. I tried to speak to someone to send this to arbitration but no one would speak to me. Case closed. This was a very frightening experience with no control in the car.