Just rebuilt the motor, terrible idle on startup

[Leviathan]

Just rebuilt a 1993 Laser RS Turbo. All stock parts (did the balance shaft removal - but that's it). The car will fire up but will not idle well at all. If you hold the throttle it will stay around 1.5K or so, but when you try and rev it up when it's near where it should be idling it seems to be breaking up... misfiring or something. But when its revving to 4K or so it's smooth. The kicker here is that I bought the car last fall and it hadn't run since 2005. So we drained out all the bad gas and put new stuff in it. That didn't seem to have an effect. Tried adjusting the CAS (flipping it 180*) that really didn't make a difference either. We hooked the MAF directly up to the throttlebody to eliminate any possiblities of leaks in the charge pipes. It still ran the same. Then we unplugged the MAF and it ran better. It still didn't idle, but it didn't seem to break up around idle. We checked the physical timing 3 times when we put it together so it's not that.

Any ideas?