-More investigation into the problem, but no real progress. Hitting the "ASR Off" button changes nothing. I checked as many grounds as I could find, and even add new ground straps between the engine and the body.
-There are a whole stack of modules in the box on the passenger side. I replaced the big "relay" with all the fuses; no change. The transmission controller was replaced last summer when I fixed the transmission. There are 3 other modules. I have ones from another 1997 E320, but I think the ASR cars use different computers. The build dates on the computers are within one month, but the connectors and descriptions are different.
-The Throttle Body itself may be the problem. With the engine running, there is no movement I can see. Also, it is part number 112 141 00 25. I thought 112 would be for the newer V6 engine, but there it is on my M104...