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1976 912 Carburetor Adjustment

Fuel System

Vehicle Information: Model: 912E; Year: 1976; Body Type: Coupe; Engine (type, size, modifications): 4 cylinder 2.0liter ; Total Mileage: 30,000;

I have modified my 912E from its original fuel injection to Weber carbs. I have tuned the carbs and it is running great except that on acceleration it sputters. It also boggs down occasionally on acceleration. I have tuned everything except the pump jets. My question is what could be the causes of the sputtering and occasional bogging down?

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