Mildy urgent idle question

[GeoffM]

Back story is here.

Urgent parts:
I parked at the gas station and my idle went up to 3k. I turned it off and felt some sputters. Filled up. Turned it back on, went back up to 3k, and wouldn't let me shift out of park.
Turned it off, used emergency key slot to put it in neutral, turned on, into gear and drove away.
But, most of the way home, my idle was 1500 - 2500. The only thing stopping me at traffic lights was HEAVY braking. I mean to the point where I could hear my brakes groaning while I was sitting there.

Strangely enough, when I got off the highway, the super high idle was gone.
When I parked, I filmed the idle bounce you saw in the back story, but no super high idle.

I'm cooling the engine down and about to change the FITV.
Suggestions? This is dangerous and I want to get it fixed before my 300 mile trip tomorrow.

[J D M C B 7]

I had high idle problems and found by adjusting the TPS on the throttle body would lower the idle to 1.2k To this day I still get a 2.0k-2.3k idle. Dunno why.

[GeoffM]

Ok, I replaced the FITV, no more bouncing idle under normal conditions.
Now, I have to start it like above, because it idles so high. I have to stomp on the brakes and hold them to remain stopped.
If I unplug the IACV, my idle drops to ~1500, but jumps up and down maybe 100.

Any suggestions?

[GeoffM]

The urgency is mostly gone. The problem still exists though. For all other posts use the back story link at the top of the page.