It shouldn't affect the tune. They don't have to flash the computer just do the misfire relearn procedure.

I understand that. Don't want them to see the tune and blame it on the tune.

I just had this done, $90 to do at my dealership.

How long did it take? I am taking the stang in next Friday. I have a few other things they have to fix and figured I would take it in at the same time instead of making 2 trips.

The actual process is simple, hook the machine up and rev it a couple times for the computer to relearn whatever it needs to do. If you have an appointment and they take care of it at that time, you should be in and out in 1 to 1.5 hours.

I had to leave mine there because I wasn't on a hard appointment, just on the list of cars that need work done. But I dropped it off at 7 am, got it back by 1 pm.

Sweet. As I said Im taking it in next Friday to get a few other things fixed and will have the vehicle dropped off for the weekend or however long it takes to fix everrything