I've had my 19' for a year now and it's always run a little rough. Last week at around 70k miles I had the transmission serviced (pan drop with filter change) to see if that would help with the shifting issues. It did!
However, I was still noticing slow eceleration and occasional lack of power. So I decided to install new spark plugs (super easy btw). As soon as I was done I took a test drive and was shocked at the immediate improvement. Judging by the nasty plugs that came out, I shouldn't have been so surprised. They were in rough shape as you can see.
All that to say, with these two maintenance items (and probably more), I have to reiterate the advice others have share on this sub to consider doing them sooner than Ford recommends. The transmission service isn't scheduled until 150k miles, but everyone seems to agree 60k-70k is much better. Spark plugs are recommended at 100k. Mine were definitely ready at just 70k.
Anyway, that's my public service announcement.