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zenith jets

Fuel System

Vehicle Information: Model: 911 T; Year: 1971; Body Type: Coupe; Engine (type, size, modifications): 2.2 l; Total Mileage: 147,000;

My stock '71T spits and sputters for a few minutes after the engine has been off for several hours. There is also an intermittent miss at all but full-throttle. I have done the cleaning and adjusting, several times. At all times, the engine idles perfectly, even cold. My question is whether today's gasoline requires different carb jets (main and/or idle)? Thanks

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