EnyKnight

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?
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