Dakota Engine Revs unexpectedly

-2000 Dodge Dakota, 4.7 liter-
-Dakota Engine Revs unexpectedly-

At no certain time or interval the engine begin to rev up.
Only slightly when the vehicle is in park, (revs maybe 250 rpm) but when you are in gear the engine will unexpectedly start to rev. So much so that when I was sitting at a red light you really have to stomp the brake to keep from going into the intersection. I replaced a few vacuum lines but that was only because, when I pulled certain lines the engine would rev up. So I replaced all the "easy to get to vacuum lines". I'm wondering whether it coincides with with pressing the brake because it seems to happen most.

I did the old "spray gumout" on all the vacuum lines to see if I could isolate the area of the leak, but the engine never rev'd once while doing this. But for all I know, it has nothing to do with the vacuum. I only thought this because it slowly got worse.
And of course, the vehicle went out of warranty just recently. :(

Does anybody have any ideas to steer me in the right direction ???
I'm not an idiot on engines, But, if its newer than an 80's model, im lost.
I can't find anything in the haynes manual to give me any ideas either.

Thanks In Advance,
EvilTex

The IAC valve is dirty or inoperative. Clean it or get another one...

Thank you, I will do that.