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High CO for GA emissions

Engine

Vehicle Information: Model: 911 Turbo Look; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 100K;

My '84 Carrera fails the GA emissions test in the CO area, by less than 2 percentage points. All other areas are acceptable. I have installed a new O2 sensor. The cat is original. Will a new cat improve this situation, or is there something else I can try?

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