Auction KIA LIMP HOME: Idles at 1,700RPM!? ('12 Forte P0507-P0110-P0605)

This poor 2012 Kia Forte has been around the block...the Auction Block that is!
It starts and runs...but as soon as you start driving BOOM throttle response is lost and the ECM goes into LIMP-HOME Mode.
3 codes are set:
P0605 Internal Control Module Read Only Memory (ROM) Error
P2110 Throttle Actuator Control System - Forced Limited RPM
P0507 Idle Control System RPM - Higher Than Expected
Let's use scan data and logic to see why the ECM cannot reduce the idle speed below 1,700rpm...
But I forgot to bring one essential tool to complete this diagnosis: a SMOKE MACHINE!
AutoLine Pro Ventus Automotive Smoke Machine:
www.amazon.com...
Enjoy!
Ivan