Yes, having seen the video, I would check the throttle cable to the TPS is free running, and that the TPS does go back to the idle position properly. Where are the return springs in the mechanism> - is there one at the TPS, and one at the pedal? - Are they OK? Is the pedal free to move on its pivot? With the pedal at idle, is there any free play in the cable?

The electrical detail I'm not sure about is whether these have an idle position switch as part of the sensor, or, whether the ECU learns where idle is by simply monitoring and storing the minimum TPS voltage. If there's a switch, it's easy, if the ECU uses minumum voltage, it's best to read live data. Live data being the best way to see what's going on regardless.