You need to give a lot more information as to how the car is actually running - what is cold idle at first start up, how/when the idle drops, what your warm idle is, whether your car reaches proper running temperature, etc. By IACV, I assume this is what we call the idle speed solenoid (ISC) on this forum, one of whose jobs it is, is to regulate the idle when you have put a load on the engine. As this is new - perhaps we can assume that it is in good condition, hopefully. Which of course doesn't mean that the connections or wiring to it are ok, or that the air hose isn't blocked up, etc.
'91 Tracker 8V, 1.6L, 5 sp, 4wd, 2dr, conv, CAMI, horribly rusty
'97 Suzuki Vitara 8v, parts car - worth its weight in gold.....
'61 NSU Quickly - 150mpg