Hey. Can anyone help us?
I have a 1989 560SL that is having the same problems. Whenever I start the car the idle stays high unless I'm in drive. Whenever it's in park or neutral the idle stays high and continues to climb until it reaches a max of about 1700 rpm.
My electrical system is having a problem too. Some of the warning lamp functions have gone out; such as the ability of the turn signal flashers to flash. They just stay on w/o blinking when turned on. I don't know if these two problems are related.
I've never had any problems with the car before. It's in mint condition with about 55k miles on it. The only other problem I've had with it is a broken ash tray door cover.
I'm a newbie to this list. I'd really be appreciative for any help you guys could give.