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Some things causing it is having the blades to far open to get it to idle because the timing isnt high enuff, pump pressure to much, float heavy or bad adjustment, worn or stuck needle valve, no gasget or 2 gasgets under needle seat, plugged up air bleeds. A air horn gsgt. bad will be a vac. leak usually not a drip from booster. Long shot is a missing or stuck check valve in the acc. pump. circut.
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