I'm replacing the stock manifold with a sickspeed intake. I bought a new idle air control and when I removed the stock intake, it had the idle air, the throttle body, and a part I haven't been able to id. the new intake doesn't have a place for this part. 4 coolant lines come from the head, One goes to the tb, then from the tb to the iac. From there , back to the head. The other 2 lines go to this mystery valve and return to the head. On the stock intake this valve is below the tb and iac. So far I've looped the two nipples to each other. Has this part been eliminated on aftermarket intakes or am I really missing something important?