Oh, well. Replacing #8 plug and coil got rid of the rough running, but I couldn't find the 38 pin data connector at the right rear of the engine compartment and it was starting to rain, so I didn't get to try any games with pin 10.

So I just drove it 42 miles home in 2nd gear. 45mph at 3550 rpm and 90-95°C on the water temp.

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'79 300SD W116
'86 190E 2.3-16V W201
'92 300D 2.5 W124
'99 E320 4MATIC S210