The idle control valve is on top of the throttle housing a cylindrical unit with the end inside the housing itself, held oin by a ring around it's base with two screws, and has a electrical TWO pin plug going to it as well, the top half is grey plastic the lower half is stainless steel.
The fact that it is able to raise the revs shows it to be working, I would check your tps output, then if you have not done so in the last few years I would replace the cts.
tabetha