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erratic idle warm start

Fuel System

Vehicle Information: Model: 1980 911 sc; Year: 1980; Body Type: Targa; Total Mileage: 125,000;

I have two problems I think are related. Warm start just fine, but with wild idle, to the point of stalling. Can keep car running just fine with a little accellerator pressure. After a couple of minutes everything is fine. Also car now surges when maintaining constant speed, similar to low rpm lugging. Above 3000 rpm everything seems to settle down and runs very well.It was a whole lot worse, new cold start regulator took care of most of problem. New plugs, rotor cap, fuel pressure check, sensor plate adjustment, new plugs and so on ? It is now just midly irritating, but I would still like to fix. Original owner 911 always well maintained. Any ideas Thanks for your help

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