car still diseling run on prob

baby, the manual secondaries have the valves or plugs dependign on the intended use. That's because the secondaries on those carbs open like primaries open... manually with your foot. So the carb has to compensate for the lean spots tipping the throttles brings. Hence the acclerator pump and PV. If the engine was in the higher rpms when the throttle was floored (like a loose convertor or two-step and clutch) then you could plug both power valve circuits and just use jetting. But there are too many "mid-throttle" conditions with most cars so you need that enrichment. Vacuum secondary carbs use the airflow thru the primaries to meter how fast the secondaries open. So that airflow is present. In fact, if you use too light a spring and get the VS bog.. it's because of the lack of airflow to pull fuel out the boosters. Theoretically you could add a PV circuit and help get rid of the bog in that situation.