Mercedes Benz repair: 1986 Mercedes 420 SEL, mercedes benz 420sel, mercedes 420 sel

Question
I recently purchased the 420SEL off of Ebay and have run into a problem with the car not idling properly while in drive. There is a screw that adjusts the amount of air that is mixed with the engine that is broken on the top. Mechanics tell me that the entire fuel injection system would have to be removed in order to get to this part. Apparently its broke inside the fuel injection system and on the outside as well. Can this one screw be replaced or do you have to replace the entire fuel injection system?  

Answer
The fuel distributor will need to be replaced.

http://catalog.mercedesshop.com/
PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1986 Mercedes Benz 420SEL
Part: Fuel Distributor
Note:  FD 60 X

C2000-162759 Fuel Distributor Bosch IN STOCK $2010.29

Answer:
No, the screw can not be replaced.