Thanks Joe. Do you mean the idle control valve? What does unplugging the idle speed control unit supposed to do (as far as fixing the surging), and where it is located? Or is this the same thing as the icv?
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."