I would try and see if the rev limit is at play. Try and do the same thing you have been doing, but keep the pedal down on the floor through the shift band. Then try it with the pedal just off the full throttle position. Might work might not.
I have the 13 SHO and the 14 Fusion 2.0 turbo. Both are equiped with the Sony system. Took the SHO in to ford because the rear speakers were not working. Service rep said this is the way the rear speakers operate and could not find anything wrong. Here's my question; did Ford install a different...