It's been 3 days now since I unplugged the EHA and it has not stalled. So I think I have finally found the culprit. However, the part is so pricey that I tend to drive the car around like this for a bit just to be sure it doesn't stall. then maybe after a week or 2 of no stalling, I'll plug in the EHA again and see if it stalls again, then I'll unplug once more to be sure. Sytematic testing! :-)

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1990 190E 3.0L