Cart Carb problem

So I picked up a Carter AFB Comp. series 625 and cannot for the life of me get it to run right.....went through it all, cleaned it up and installed will all new base gaskets....and it runs but keeps wanting to die out now matter how I adjust it. Sprayed starting fluid all around the intake, linkages and base, nothing revs.....but if I hold my hand over the top of the carb it revs up.....does that constitute a vacuum leak somewhere? or should I be looking at something else......