OK, now we are getting somewhere. Although this is not necessarily a good thing in your case. There's no 'base idle' adjustment in the fuel system and engine I thought we were talking about. Neither is there a screw setting the position of the throttle plate, not even a MAS.

Best thing you can do is start a new thread instead of necroing this old one, post the engine numbers so we know what version we're talking about and do some research.

There's more than enough info available in this forum to fix anything, and everything, that goes wrong with a Benz. Once you've done that, you can start thinking about reliability. The worst thing you can do, ever, is to buy a 17-year-old benz with no service history and expect it to run like a new car. Took me three years to fix all that was wrong with my 300E and now I wouldn't swap it for anything.

good luck

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1987 300e manual 250,000 km (sold)