1991 Acura Integra HIGH idle (stuck, no fluctuation)

I have a 1991 Integra that I bought off a buddy with a 'crank no start' issue

He was driving the car daily, until about a week ago when the car died on him while driving.
He has no money for parts, or skills to diagnose the issue.

I bought the car from him.

Ecu was throwing code 13: Barometric sensor.

So I replaced the ecu with a known working pr4.
I also replaced the distributor and the car started right up.

When the car started, the idle shot to 4,000 rpm and lagged when I would gas it.

Thinking it was an intake manifold gasket causing a vacuum leak, I replaced it.

Throttle cable is not over tightened.
I have tried 2 IACV's and it didn't help the problem.
Tried an IACV block off, that didn't help anything.
Idle screw does not change anything.
FITV was removed, cleaned and replaced and still didn't help, so I replaced it with another FITV. Still no luck.
New throttle body gasket, still no change it idle.
With the intake removed, I can cover the bottom port on my throttle body, and that effects the idle the most.
Tried testing for vacuum leak with brake clean/MAF cleaner at my shop, and could not find any cracked hoses, misrouted vacuum lines, or leaks on the system.


I start the car.
Car revs itself to 3500-4000rpm and will not go any lower.
I have tried almost everything I can think of, and I'm not goin to throw parts and money at it to try and fix this idle issue.

When I shut the car off, it shakes violently as if it were running out of time, and it smells of raw fuel.

I cannot find anyone with this similar problem. I have been researching for days.
Any input/help is much appreciated.
I'm baffled.