My '80 300D just doesn't seem to like the block cooling below 100*F . It acts like the glow plugs aren't working and just cranks and belches smoke until it finally (sometimes) catches and runs. Once it's running,even just for a minute, if I shut it off it'll start again as it always used to and run fine . Filters are clean , gp's work , valves adjusted and a diesel purge done , cranking speed seems normal . Next on my list is to upgrade my gp's to new afterglow style c/w new relay , and following Thomaspin's manual I'm going to clean my injectors.

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