idle issue

So just got my intake manifold gaskets fixed by a garage, had a vac leak.. now my car is idling low and throwing a random cylinder misfire code, thinking it can be egr needs to be cleaned, mass air flow sensor, or the idle air control valve..
ive done egr valve before,
Mass air flow sensor i can figure out.

But i dont even know where the idle air control valve is. anyone got a pic or can explain where it is? or a how to?

I know my car is running very rich. spark plugs have white residue on the tips (plug side)

i did the carb cleaner around the intake manifold to make sure it was sealed properly..

car runs fine driving wise, just sporatic idle bounces.. between 5-700

In the how to thread for Egr valve go thru the thread within like the first 20 pages they talk about doing the iac valve

Well i gleaner egr and cleaned the maf seems like it did the trick.. i didnt have the bit to do the iacv.
Seems to have done the trick though no bouncing idle at stops anymore. Thanks! and car is running smoother.
think it was the maf.. my egr was black but the valve still moved easily