Help me get the off-idle stumble out of my QF 750-AN Double Pumper

ok since the air bleeds helped a lot that tells me it is not the accelerator pump circuit it's the transistion circuit. Next thing you need to do is determine what size idle feed restrictors are in your carburetor. My super street 680cfm came with .031's, you can call quick fuel and ask them what size are in your carburetor.
There are 2 idle feed restrictors in each metering block, they are up top and they can be removed with a small flat head screw driver, go up .002 on the idle feed restrictors, so say you have .031 try the .033's. After putting bigger idle feed restrictors in the carburetor re-set your idle mixture screws to the highest vaccum reading and see if that takes care of your problem, I'm about 80 percent sure this will cure it.