One problem related to car accelerates on its own has been reported for the 2003 Lexus GS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Lexus GS based on all problems reported for the 2003 GS.
When backing into a parking space with my foot on the brake, the rpms surged causing speed to increase suddenly. I place the car in neutral and the rpms continued to surge for about three seconds and then returned to normal. While waiting at a traffic signal, with my foot on the brake, the rpms suddenly surged and I again placed the car in neutral. The surge continued for about three seconds again. On one other occasion, when shifting from reverse to drive while exiting a parking space, the rpms surged for about two seconds and then returned to normal. The vehicle seems to accelerate suddenly on its own without depressing the gas pedal.