Vacume leak i think and hope?

[Redline_7]

Ok I have a 86 7 with a "newer" engin in it. The old one was replaced a couple of years before I bought it(2002). The engine runs fine when warm, no smoke and plenty of power, but I think I have a Vacume leak. It hardly ever does the excelerated warm up cycle when I start it anymore (did it most of the time when I bought it) and lately I'll run into town and back, let it sit for say 20 min so its still somewhat warm, but when i start it it refuses to idle unless i rev it up for a few seconds then its fine? So far all I've done for mods are 3" to 2" header back custome exhaust, 6th port actuation rig up, and custom ram air. Any help would be apreciated If you would like more info on my car my cardomain site it http://members.cardomain.com/whtknight thanks