Engine Noise problems of the 2005 Toyota Avalon

Tl the contact owns a 2005 Toyota Avalon. While driving, the contact depressed the brake pedal and the vehicle came to a slow stop. The contact stated that the engine made a revving noise, but the accelerator pedal was not depressed. There were no warning indicators illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the computer needed to be reprogrammed. The computer was reprogrammed; however, the failure recurred. The vehicle was not repaired. The dealer was not contacted. The manufacturer was not notified of the failure. The approximate failure mileage was 81,000.