One problem related to car accelerates on its own has been reported for the 1998 Lexus RX300. The most recently reported issues are listed below.
1998 Lexus RX 300 spun out of control and rolled over. This was in 2002 August and I had called Lexus to check if there is a sudden acceleration or a roll over problem. They said none. I decided not to engage a forensic engineer to investigate because that would delay the insurance pay back. My wife walked away with minimal injuries but nevertheless, we still discuss what could have caused the problem.