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1987 944 Rough idle

Engine

Vehicle Information: Model(924/944/968): 944; Year: 1987; Body Type: Cabriolet; Total Mileage: 98700;

I have recently replaced the idle control valve, (3 months)and the rough idle has reappeared. Is it possble that the valve could be faulty, or is this a sign of other over-looked problems. The manual does not describe testing of the valve.

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