[helifino]

With the engine running at temp, unplug the IAC and the idle should drop to a just barely running 450-500 rpm. If not, someone may have opened the bleed air adjustment or throttle stop to raise the idle, and your cleaning everything may have fixed the original issue..

Another possibility is a sticking evap purge valve, it can be cleaned in the same manner as the IAC

 

[helifino]

purge sounds more likely. It wouldn't throw a code if it completely closes within a few minutes after the engine shuts off (when the evap monitors run)

 

[helifino]

oh, there's something. With all the new parts it may need adaptations relearn. take out the keepalive power fuse (on the 04 ohv it's shared with the AC) for a few minutes (technically it should be immediate but electronics can be odd) and run it through a drive cycle (up to temp at least) and see if it improves.

 

[helifino]

If you take the belt off just go ahead and hand-spin all the spinny bits to see if anything else is binding.

 

[helifino]

I noticed when turning on the AC compressor / heat, the RPM bounces up initially then drops to about 700.

Normal, should smooth out when the idle adaptations learn.