I have a 1987 560 sel.It ran great from 1500rpm on up but at idle the whole car would shake.Sounded like a vacuum leak.But what it was was the Lambda(?). I noticed the tower in front of the fuel distibutor had the cover off so some one was messing with it.Anyway I just started adjusting it clockwise(richer) until I got it pretty good.Total of about 3/4 of a turn. It also solved my economy guage problem.At idle it used to be about 1/4 of an inch towards the right in gear, now it is almost full left.Also my erratic shifting is gone nice and smooth. It is not perfect but it is about 80%. I am going to adjust the EHA when I find a 2mm hex. I will see what 1/4 turn does.
It is like a new car!

Would think our 126 engines were similar but mine is a euro.

Is the lambda in that area?

What is this tower in front of fuel dist?
On mine therer is the tube which controls Fuels ratio?
I was told clockwise would lead to stall so I'd assume that was leaner. It would suggest counterclockwise was richer.

????

I am having issues & fuel mix may be on the list.

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83 500 SEC Euro 198K