"Factory" vacuum leak???

Crap! With this "fresh air intake" installed I can't get my idle down below 800 no matter how far I turn in the mixture screws and with the idle speed screw not touching anything. Also, it never returns to within 75-100 rpm of where it started if you blip the throttle. All linkage moves freely. Timing is about 5 degrees BTDC - if I put it anywhere near where I want it at about 8-10 my idle is even higher. New gaskets all around (carbwise) and there are only two vacuum hoses - PCV (new hose and valve), and vacume advance. Vac advance makes no difference to this problem if it's plugged or unplugged. I've sprayed carb cleaner, propane and startting fluid everywhere to try and find this effin vac leak I KNOW I have. AARRGGGHHH!!! A little help pretty please. :D