Question about idle problem?

I just got done replacing my head on my 2g talon and now when I start it it will idle fine but when I go to drive it then will want to die or idle extremely low whenever I come to a stop or go to park. If I let it sit for a while it will gradually come back up to normal but I can't seem to find anything or know of anything that would cause this. I also rewired the fuel pump at the same time I did the head. Would anyone know whats going on?
Thanks