Just finish looking at a 90 300sl. Absolutely glorious condition. Looks just like it was off a showroom floor, I'm not kidding. Has 105k on the clicker. Car runs excellent. But when backing up, gear whines a bit, and when the gas pedal is not depress, the car clunks when it stops. Also, I notice some noise that sounds like an air leaking in the the right rear end of the car. Any suggestions. I love this car's condition so much that I can bypass this would-be problem if I know what it is. Don't have the time to get the car check because I live 450 miles away. Any owner out there know what it is. Can you please help ASAP because the car will probably sell fast!