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1989 944 Turbo Rough running

Engine

Vehicle Information: Model(924/944/968): 944; Year: 1989; Body Type: Coupe; Total Mileage: 175,000;

My car sputters significantly and blows black smoke when i reach 4000 rpm's. It has virtually no power past 4000 rpm's. one of the intercooler hoses was very loose so i tightened it and it seems to have helped but not completely eliminated the sputtering. i believe the pop off valve is defective because it will not hold suction. Would a defective pop off valve cause this sputtering?

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