Have you checked to see what DTCs are appearing- if any? Perhaps the problem is not the transmission, but just seems to be. Maybe the reason it is surging without power once you come to a stop the first time is because the idle is simply not high enough. Your symptoms are typical TPS symptoms. I doubt that a TBS of 69k or 34k miles would be bad, but it certainly isn't unheard of. Can you verify that the part is a factory part, and what that factory part number is. It seems strange that your engine was swapped without swapping the transmission at the same time. IMO it would've been worth the shop's time to swap both from a wrecked vehicle, then sell trans from the car whether the customer wanted to pay extra for it or not. It would certainly save labor to remove both as a single unit. Then again, I've been wondering WTF most people are thinking these days anyway- stupidity seems globally rampant. Another explanation is that the donor vehicle was a MT, and if that is the case, then the TB would have to be swapped from the old engine or it wouldn't hook up to the AT. Have you verified that you have an AT TB installed? On an 09, it should have 2 cables attached- one for Cruise, and one for the kickdown linkage.
OH crap, that reminds me..... you have the freaking electric TB. Your TB could be the problem. We have seen that several times and it is more likely to happen earlier on in the car's life.
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