OK The car:
1985 500SEL
196,000 mI

On cold start - very very rough, black smoke worse than a sick diesel, rough in any RPM range

missing when hot at idle and black smoke, smooth at running speeds

Seems to be a vac leak somewhere, as climate control defaults to defrost when driving

could this be the only cause?

Not familiar with the gassers - about to resort to a indy

could the original timing chain have anything to do with it?
I have looked and looked for the vac leak w/tester but not familiar enough with the engine to find. It looks like the lines UNDER the intake are not in the correct spots. are there any diagrams for this?

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1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4