[whirnot]

If adjusting the GAV changes your idle, then the idle is too fast. The gav feeds the cap jet only, which is used only in mid to high speed use. The idle mixture can be adjusted at the carb, but remember it is an air mixture screw, so opening it, will lean it out. The gav is used to richen the mid speed mixture until warm up. A lot of folks open it 1/2 to 3/4 of a turn, then as it warms up close it for better mileage. It's something you kind of play with, but as I said, it should not affect idle at all.