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If it coughs then picks up, you have a flat spot in fuel delivery. The carb is not squirting enough gas with the accelerator pump to cover up that hole, a cough is going lean. If it chokes up then cleans out (like my chain smoking uncle with emphesema) then it is rich, or your secondaries are opening too early causing a lack of velocity past the boosters, and thus poor fuel metering until airflow picks up and you need the secondary butterflies open.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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