It did its dance 7 times with the position at II

Great help, thank you. So the thing is reading, and there are no codes.

So where to begin on a nailing idle and loss of power on hills?

I pulled the rubber line from the steel line that runs to the tank (under the hood) and diesel dripped out at a pretty good stream. I had suspected the fuel screen.

Could the nailing, vibration-filled idle and lack of power be related to an injector? Any other suggestions to help diagnose this one? Thanks friends.

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1994 E420 43k (pickup, solid)
1990 300D 2.5 127k (sold) (now driven by friend)
1991 300D 2.5 73k (sold) (incredible car)