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1987 944S Loading up at start

Engine

Vehicle Information: Model(924/944/968): 944S, 944S; Year: 1987; Body Type: Coupe; Total Mileage: 52000;

I just bought my wife a nice 944S, and it seems to run nicely except after start until it warms up. Sometimes it belches out fuel smoke (Doesn't seem like oil smoke), but even if it doesn't it loads up under acceleration until it's warm and has had an "Italian tune up", then it runs fine. I was thinking oxy sensor, but what else should I check? I did put a bottle of injector cleaner in the tank, but we haven't run that tank out yet.

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