So the car wanting to launch itself forward ended up being a problem as I found myself barely applying any pressure to the pedal at all and the car rapidly increasing in speed. Though it did climb steady without any of the high revving and downshifting as with trying to overtake a car. So I took the FD off again and checked to see if I had missed anything and upon reassembly I discovered that the airflow meter boot that sits on the throttle body was actually being grazed by the accelerator linkage rod! No wonder. I adjusted the air cleaner housing bushing by raising it up a few millimeters and the problem seems to be corrected. Glad that linkage didn't get stuck or hung up on that boot otherwise that would not have been good.

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1990 190E 3.0L