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rough idle on 993

Engine

Vehicle Information: Year: 1997; Body Type: Coupe; Total Mileage: 45,000;

I seem to have an intermittent rough idle on my '97 C4S. We tried different injectors, coil etc and it made no difference. What else should be tried? The mechanic says that the computer is working overtime to try to smooth out the idle. No fault code was in the computer.

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