Just to close the loop on this one, I purchased a used version of the part which I linked to in my first post (APPS, accelerator pedal position sensor, 0125423317). This fixed the problem. Hopefully nothing happens to cause the APPS to fail again. I tried to get the part at a somewhat local upick salvage yard, but they were sort of closed due to Covid. So I ended up buying it for $30 on ebay.

Thanks everyone for your help.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).