[Tampa Tuning]

I find it odd that the dealership would ask someone to modify the stock tune because they can not fix a problem. Sounds like something mechanical causing the misfire, but as long as they are covering your motor and transmission under warranty, Id be a happy camper !

In your scanner you can view your misfires, and at least see what your sensors are telling you whats being measured just before and after the misfires.

If they are installing a new PCM with a stock tune and you still read misfires like you did before the PCM exchange, then Id think it was mechanical not a computer setting.

Not very helpful, Sorry.