Have you searched/researched bliss screw adjustments? Also make sure that your throttle cable has enough slack. I recently put my 1999 GSX back together and I've been working on the idle for 3 days. I finally have it pretty solid after;
1. Fixing the throttle cable so it gives enough slack for the gate to close fully.
2. Letting the car warm up until its fans are going on and off, and letting it try and "find" its idle.
3. Adjusting the BLISS screw in all the way until it is trying to die, and then adjusting it out again a couple turns.
4. If you've done all this and you're still having problems you may have a bad FIAV which may be solved by following these instructions from RRE folks. FIAV Adjustment/Disable
PS what engine management system are you using? If you have no boost leaks, and the throttle cable is giving enough slack, and the TPS is showing 0% when the throttle is off, and your BLISS screw is set appropriately you should be able to get even a very lumpy cam to idle.