My dad had his MKT in twice for Ecoboost issues... Hesitation under acceleration too! Felt like it was pulling timing. All plugs replaced at 8,000 miles, reflashed, went away for a while. Then came back again, and still hasn't been resolved.
I think there may be something to it...
Oh im not saying they might ahve a issue. Got 2 friends with them and they have had problems but they still love them. I can tell ya there is a coil problem that fouls and, the cats start to melt and it acts just like what you are talking about. Full tq at 2500rpm is awesome not saying that the 6.2 is a bad engine but its max tq aint till 4500.