Check the OVP and if that checks out fine then it's the EHA. It causes the fuel pressure to drop down to the point where your car stalls out instead of keeping it idling normally. What you can do is start the car up and then disconnect the plug to the EHA. Car should not stall out anymore after coming to an intersection, assuming the problem is the EHA. I guess you can drive like that until you get a new one. I ran mine like that for a week just to be sure it was the eha, after no more stalling I ended up getting a new one, although I probably could've just left it unplugged.

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1990 190E 3.0L