Thanks for the responses!
No wheezing. After I throttle up, it sounds like it is starving for gas.
It was only a few weeks between runnings, so gas was good. Vent was open
I did visually verify operation of the choke/throttle yesterday, so that's not it. New plug/oil/fuel yesterday -- same problem.
The outside of the carb has a small amount of varnish(likely from old spillage), but not much. The (new) plug was very slightly darkened after a few minutes of running, but not fouled or burned, so that looks OK.
Disassembling the carb is likely in my future. I'll let you know what I find! If I do destroy the gaskets, any recommendation on where to order replacements?