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1991 964 runs rough at idle after service

Engine

Vehicle Information: Year: 1991; Body Type: Cabriolet; Total Mileage: 61,000;

My car was running perfectly until i brought it in for an oil change, new fuel filler and spark plugs. Upon return, my car runs rough at idle.The mechanic worked on it but can't seem to identify the problem. He replaced the wires but to no avail. Any ideas ?

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