I have a d16y7 planing to put a mini together. z6 head and manifold. Right now i just have the intake manifold from the z6 on without the head. i got all on and it runs, but not smooth at all. at 1500rpm it revs up and down like im caming, then once it hits 2 it wont stop going up.. i think it is the IAC sensor and i checked the engine light code and it was the IAC. so now i see that there are 3 wires that went to my old intake manifold and only 2 can plug into the new one. What do i wire? do have have to wire anything different to the ecu?

here some pic if it helps
http://s100.photobucket.com/albums/m3/candy4randy/d16/