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The air meter deflection should be barely noticeable at idle, so that sounds like it is normal.
The soot on your plugs does tend to indicate a rich situation.
Granted, they're never getting up to temperature with such short runs, so they're not self cleaning, but it still sounds like too much fuel.
To test that, try introducing a vacuum leak. If you can get it to run by letting some air in bypassing the meter flap, then you are too rich and I would suspect dripping/leaky injectors.
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-tp
1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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