On start-up and during the first few hours of use all is well but, when we shut off the engine and lounge for a while, we have what I suspect to be a fuel flow problem on throttle up.  The engine starts crisply but, as I throttle up, the engine starts to stall like it’s not getting enough fuel.  A second try and, sometimes a third try at throttle-up is needed to sustain fuel flow and then, off we go.  I’ve changed the fuel filter, regularly add gasoline stabilizer with each fill up, and fog the carburetor each fall for winter lay-up.  Could the problem be related to “gumming - up “in the carburetor and would the addition of “GUMOUT Fuel Additive” to the gas tank possibly solve the problem?  Are there any concerns with trying the carburetor cleaner in an I / O?  Thank you for your input.