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1993 968 Check engine light on - car runs rough

Engine

Vehicle Information: Model(924/944/968): 968; Year: 1993; Body Type: Coupe; Total Mileage: 168,000;

Just before I put the car away for the winter, I noticed the CEL coming on, and going off. Progressively, the car began to idle rough and was difficult to start, often feeling like it was running on 2 or 3 cylinders. The last time I drove the car it did not want to run at all under 4,500rpm and was almost impossible to drive: I barely made it home. I replaced the DME relay and cleaned the MAF unit with cleaner specific to MAF's that I purchased at a local Pep Boys. None of this made any difference. Do I need a replacement MAF? What could be the problem?

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