My 92 SC400 after 168331 miles has let me down. Started up the other morning fine, after driving a short distance went to restart about 5 minutes latter and it would only turnover. After sitting approx 15 minutes started right up. Mechanic replaced the computer, drove the car home and the next morning when starting it ran rough and shut off within seconds. Since then the mechanic has replaced the computer with two other rebuilt ones (his thoughts were the rebuilts were defective)...still the same problem.