4000-5000 RPM idle after engine swap

[GRNGBLN]

Hi, to start, my car is a 2004 Impreza 2.5TS 5MT with a 2000 Impreza L phase 2 EJ22 in it.

To complete this swap, I transfered the intake and exhaust manifolds with any sensors and such associated, as well as the cam and crank sprockets. While the EJ222 was out, I replaced the valve cover gaskets and timing belt.

I had a hiccup when getting it started that I didn't swap the cam and crank gears, so I had to go back in to do that, and when I fired it up, it would not go lower than 4000rpm, sometimes up to 5000 and I shut it off before I can see if it will go any higher. I tried cleaning the IACV which didn't help, followed by replacing it, which brought my rpm down to about 3000, before climbing right back up to 4500 a couple seconds later.

I am getting codes P0519 AND P0113 currently, although the airbox and thus, IAT sensor, are not currently attached.

 

Anyone have recommendations on what would be causing this ridiculously high idle?

Thanks. 

[lmdew]

Make sure the throttle plate is all the way closed.  I'd get the airbox and all hoses back on/connected.