On lower mileage cars, simply cleaning the carburetor (requires gasket set) may correct poor running or rough idle. However, on high mileage Porsche® the carburetors may need to be completely rebuilt. Repair kit includes all gaskets, "O" Ring, washers, air adjustment screw (if necessary), needle and seat. For accurate measuring of accelerator pump delivery, we recommend the use of an accelerator pump vial when rebuilding your carburetors.