I have researched this from several sources and it seems to me that there were a number of different emissions set-ups on these cars from 1970 - 1972. Mine does have the idle fuel shut-off solenoids on both carbs. The only colored hoses are the red one from the distibutor advance to the front vacuum control valve and the brown one that leads from the top of the front vacuum control valve to the front carb. All of the other hoses are your basic opaque "plastic" looking stuff. I believe the dashpot is supposed to increase idle when the engine is under load.

Ryan

__________________
RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE