Get a new cap and rotor -- if they were carbon tracked, cleaning won't fix the misfire for long.

The warmup regulator will be plumbed in the fuel system -- it lowers the pressure in the bottom half of the fuel distributor so that there is more fuel delivered. There is also a pressure regulator between the fuel distributor and the return line -- no electricals on these.

You can test the cold start valve by applying battery voltage on stopped engine -- it should spray as long as there is pressure in the system. In operation, it should energize briefly when cranking at low temps -- time is determined by the thermo-time switch and a relay.

Fuel mixture is adjsted with a concealed allen screw -- not sure where it is on the M110, but somwhere between the air meter flap and the fuel distributor.

Idle speed will be controlled by a bleed screw in the idle air line. There is also a cold idle system attached to the block, I believe, with two air hoses also. May also be a decel valve to feed air in on hard decelceration, but I'm not sure about that. There was on my Audi Fox of similar vintage.

Timing specs should be on a sticker in the engine compartment if it hasn't shrunk so bad you can't see it. My Childtons' lists ) TDC as the correct timing at 800 rpm

Make sure the vac system for advance and or retard is connected correctly and working before setting the timing! Else it may end up strange.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!