ECM arrived and so did the nicer weather. I set the pot back up correctly as per Brew's instructions- everything normal again. Except of course the 10%. Soooo... I am looking at my ECM and it looks like this:

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E