I'm with TampaTuning, I don't think it's the TB at all.
I don't have any ideas as to what it is,
but I'd be surprised if it's the TB.
The code is PCM problem. Dealer will be your best option.
The rest is normal. Service Stabilitrac/Reduced engine power is common and the exhaust recirculation is another function of the computer. I'd just take it to the dealer.