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1976 911S Running Problems

Fuel System

Vehicle Information: Model: 911S; Year: 1976; Body Type: Targa; Total Mileage: 122,000;

Is it the fuel distributor? After using a chemical fuel system cleanerSTP, my car ran better than ever for a few days, including a drive over amountain pass. The car was able to run smoothly, from a cold start, inthe low 2000 rpm range which was previously not possible. After makingthe same mountain pass drive four or five days after using STP my carhasn't run the same. I have lost all acceleration, there is no poweruntil the 3-4000 rpm range (depending on how warm)and starting has becomemore difficult.

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