Code P1120

I don't have a scanner. I've heard of people putting Mustang throttle body's on these 2.0 engines but not sure what make and model Mustang TB. I'd see like an aluminum throttle body either way. It still has P1120 code after third. TPS. The original Ford TPS I removed wasn't spring loaded like the aftermarket part store ones I bought so I thought that was going to fix the problem and may have been its own problem but not the high idle problem. On a cold start it idles at 1200 for 10-15 seconds then quickly jumps straight to 2700 and slowly rises a little more. It jumps up so quick as if a sensor is making it or the PCM is telling it to. I unplug idle air control valve then it idles at 1200 so is the PCM telling the idle control to open or is the idle control bad? I don't think its bad because it obviously opens and closes. I have cleaned it and put a new gasket on it and swapped a used one and was worse with the other one so idk. Also there is a lot of oil around all the spark plugs. I read this can cause misfired and run rough. The car did sit a while and I drained the old gas and put 93 Octane in it but haven't changed fuel filter yet so I'm hoping that and the oil are causing it to have no power on top end but who knows. I'm so frustrated at this point.

Here's a video that will helpfully help you understand. Also I pumped almost all the old gas out of the tank with the used pump I put in it and it didn't take long so I assumed the pump is pumping plenty. I then drained last of gas out and out 93 in it and the screen filter on pump and assembly were clean.

Thank you. I'll have to take it somewhere. With the idle control unplugged it idles at 1,200 until I hit gas then hangs around 2,000 then drops to 1,200 but while I drive it stays at 2,000 when I push in clutch because it doesn't have time to drop down to 1,200. When I cover cold air intake it shuts off. Would that mean no vacuum leak?