One more interesting tidbit: switching the a/c compressor on (or off) will smooth out the idle for a few seconds, then it goes back to revving. The tech manual says there is a compressor cutin signal to the computer that increases the engine speed by 50rpm with the compressor on.

Would that point to the actuator? I was thinking the cutin signal might give the actuator a few seconds of stability before it goes back to having problems?