[dbral]

Excited to see how your Toyota turns out. Looking good so far and surprisingly decent amount of room in the engine bay for fun stuff add-ons

According to the GM FSM, the IAC pintle bottoms out then retracts a predetermined distance every time the key is turned off.....the key off thing surprised me but i guess it makes sense though. Assume that holds true for your performance tune and stand-alone but not sure there

Can you confirm if the commanded IAC counts are trying compensate and elevate the idle when the low idle problem occurs?

Possibly an issue with the TB causing the butterfly to physically not close in the same spot inside the bore consistently maybe? Loose butterfly/throttle shaft screws, exc.play in throttle shaft, worn/notchy throttle stop or screw, binding throttle cable or cable adj. too tight possibly. Does the TPS show the same return voltage every time the throttle is closed? Maybe the TPS itself is physically binding lol

Suppose you could verify correct pintle direction by plugging in another IAC to your harness and watch it move while commanding it with a scan tool. Looks like if you command a lower idle speed, the pintle should extend away from the IAC body. Over extension/retraction may NOK the test part though, especially if you turn the key off with it still hooked up lol, but thinking this should verify the direction.

Cool pic and waiting to hear what you decide for sure with the drivetrain swap