W123, Electrical

1982 300D Mild engine shake and smoke exhaust at initial startup

I am having a 'rough idle' issue I cannot seem to resolve; I will categorize as mild because I have worked on a two 240D (1980, 1981) and I was able to perform the recommended maintenance to have them idle very smoothly.
Additionally, hard initial start or it quits right after initial startup, then I am getting a blue smoke from the exhaust at the initial startup and for about 10 minutes before complete warmup.

Here is what I have done up to this point using the manuals, advice, and parts from mercedessource:

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'80 Wagon self leveling suspension question

Greetings,

I can hear some clunking with riding over bumps in the road. I read
Kent's SLS troubleshooting guide for some tips. All of the following
checked out: no leaks, fluid level good, pump working, sway bar links tight,
pulled an accumulator and seal good.

What isn't working is the manual operation of the leveling valve. I can
also see some cracks in the differential mount. The valve was replaced
1-2 yrs ago. I have a new mount, but stopped upon finding the valve was not
responding to manual operation. Any ideas/suggestion?

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Rough idle after warm up 1985 300D

I bought this car Nov 2004 and it had a rough idle when warmed up. In an effort to solve this I set the valves, replaced the injectors with rebuilt ones. No help. Meanwhile, and for other reasons, I installed a rebuilt engine Jul 2006. By Sep 2006 it too was idling rough after warm up.
Once again I verified valve settings and replaced the injectors with rebuilt units. I also replaced and adjusted the damper bolt, replaced the the motor mounts, transmission mounts and the engine shocks. No help.
In Jun 2007 I went all out and put in a dealer supplied rebuilt injection pump. No help.

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