A cookie for an anwser!

Ok I have this really weird problem with my 92' Civic 1.5 auto. I'v e got a tc throttle body, Obx intake and a custom exaust. Im also running nitrous, but thats irrelevant. Where my problem begins is when I turn on the car the engine revs to 1.5 and then drops to 1 and keeps repeating that until it heats up. Then when it heats up, it idle's at 0.3 barely at all. It sometimes cuts off because of it. I've tried idleing up, both ways on the throttle body and it just won't idel up. I've replaced the O2 sensor and disconnected it altogather. The timing belt is also brand new. it's an annoying prob that I would like to fix. I'll give ya a cookie for some help.