bdreed,
Nobody said there may have been obstructions in the hole in that plate on the carb. What Mike was explaining was how to fix a possible fuel metering problem that's causing your problem. Wenting that hole to an area with the same pressure as the intake (need to use a trompet and run line to same) or to a more constant pressure area, as in inside the fuse, will make the carb. meter the same no matter the airplanes situation and attitude, i.e. on the ground or in the air, pointing up or down.
DKjens