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I have found four things that affect this symptom over 20 years of seeing it. Vacuum leaks, ignition timing, spark plugs and mixture. Check for vacuum leaks at the injector sleeves with an unlit propane torch at idle. If you get an idle speed change, the injector sleeve O rings are baked. If you have the vacuum retard distributor, disconnect and plug the grey hose, rest the idle to 950 rpm, and see if it goes away the next day. If you do not have a vac retard distributor , set the timing at the high end of the spec. Use Bosch Normal plugs. On the +80 SC, it helps to set the closed loop mixture to 25-35 dwell, and the ******** super switch can help. On an earlier SC, if nothing else works, richen up the mixture slightly and try again. If you want to solve this problem, you need to make minor changes over several days, because you really only get one cold start a day.
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Paul
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