I am working on a '87-420SEL and the idle speed won't come down below 1100rpm. I cleaned out the idle stabilizer and it is working. Is there an adjustment screw somewhere on the CIS to get the idle down to a right setting?

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.