Limp mode or something else?

Jhill

So first get the code data so you know what information is there but second the part that should be a sign is you say it doesn’t happen on the old tune and only his. Whenever I diagnosed cars if something doesn’t happen with one part (in this case tune) and does with another then that would lead me to the direction of the problem part. If engine, TB’s, supercharger are all the same yet works with one and not the other then I’d be very hesitant to replace hard parts that are working perfectly fine in one scenario vs another.