I can't understand why the need for an aftermarket tune when these later 3rd gen's perform fine to begin with, plus some of those aftermarket tunes have failed emission testing here. If the op is experiencing some sort of issue, it needs to go back for service. My 2019 v6 automatic performs as sharp as any car, or truck with an automatic I've driven, and smoother than many. I gotta wonder if the op's truck doesn't have the latest tsb that corrects all that transmission hunting, and wimpy low end. After the dealer performed that tsb on my 2019 sr5 v6, its been a different truck ever since.