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911S 1976 2.7 failed smog check on CO

Fuel System

Vehicle Information: Model: 911S; Year: 1976; Body Type: Coupe; Total Mileage: 156,000;

My 911S failed smog check, while it always passed with flying color. I was told that this year CA added additional requirement.Both the HC and NO passed with average limit.The CO failed with 2.31 limit at 1.41 I have checked the air pump, filters and tested twice with little change.Please advise which area I should look into...thanks!BTW, is it true that by 2006, all 1976 car will be exempt from smog check?

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