After reading your post I think I am going to try that. Did your vacuum gauge move closer to the red at idle as well? I am quite sure the EHA has been adjusted before because you can tell the screw has been removed and reinstalled if you look at it carefully. I was hoping to avoid buying that Harbor Freight fuel injection system tester as I have spent close to $200 on tools between the 240D and 190 in the last month, but I guess it may come in handy again someday.

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1983 240D 4spd
1984 190E 5spd
1987 300D (sitting for a year or two)
1989 Toyota Camry 5spd (current DD)