1984 380SL missing during idle

My '84 380SL is missing during idle when the weather is hot and occasionally just stops.(seems to lean) During the colder periods, the engine blows black smoke out during startup but clears and runs well after about a minute.(seems to rich) While driving the car seems to run excellent. I've taken it to a mechanic who has changed the plug wires, distributor, rotor and 'adjusted' the fuel/O2. No luck. After research on newsgroups, could this be the control pressure regulator (warm-up regulator) that is the real culprit here and is there something I can do short of just replacing it on a guess???

I have replaced many of the warm up regulators and in most cases when you are having this type of problem it is the culprit.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Although it's a little late, somebody might check the archives for similiar problems. The answer to this problem WAS the warm-up regulator. All if now fine. Thanks to Benzmac.

[Benzmac]

Thanks for letting us know we helped!!
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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM