sorry I think I left a few words out of that sentence.... I meant to say, what revs does it idle at in gear (generally lower than neutral in an auto, and turning on the aircon should raise the revs)
but anyway I think you found the problem, any vacuum nipple without a hose must cause a leak. if you put your finger over it when the engine is running can you feel it sucking, and does it start to idle higher? If that is not the leak you might also have a small split in one of the hoses (very easy when removing and replacing brittle stock hoses, so double check everything. also check all the hose clamps that you had to undo on the intake to fit the turbo