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1989 944 Turbo Cold start problem

Engine

Vehicle Information: Model(924/944/968): 944 TURBO; Year: 1989; Body Type: Coupe; Total Mileage: 55,000;

My car has a cold starting problem. It starts immediately but the idle varies back and forth from 600 to 1400 rpm without touching the accelerator. I don't know if it's rich or lean during this first minute but it will not run well enough to pull itself. After this initial minute of variable idle and no power the car runs and starts fine until it cools off and then it has the same problem.When it was recently serviced the technician checked the fuel pressure before and after starting, the coolant sensor output, and "other things" and found them to be within specs.For what it's worth the car appears to be running very rich and has a lot of soot in the tailpipe.What should I ask them to look for when I take it back? Oxygen sensor?

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