I have an 1989 560SL.
When I try to use the cruise control sometimes - not often - it works okay for awhile. BUT...usually when I try to use it, it immedialtely accelerates (whether use it from set/accelerate or set/decelerate) and speeds up then slows down. It is so erratic that I can only leave it on for a few seconds before I touch the brake to turn it off - kind of scary.
Any thoughts on needed parts. Not sure if it is the amplifier or actuator of ???
Thanks!