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1970 911E Engine snapping noise at idle

Engine

Vehicle Information: Model: 911 E; Year: 1970; Body Type: Coupe; Engine (type, size, modifications): 2.2; Total Mileage: 115000;

At idle, when the car is warm I get an intermittent snapping sound. When I was in the aircraft business I used aviation fuel until two years ago when I went to unleaded fuel. I never had the noise prior to switching to unleaded. I am using a Swepco additive recommend by a mechanic. Any suggestions?

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