You may want to post your questions in the V-10 forums before you call the dealer, so you can be more prepared for your questions. The dealer is going to tell you it has a problem, and they can cure it, just get your cash ready

My brother had a v-10 in his one truck, I never thought it ran quite right, but it was factory, and everything was as it was supposed to be.

A V-10 feels a bit different than a V-8, or I-6


Back to the reason for my reply, there is a great bunch of guys that hang out in the V-10 forum, so here's the link
Modular V10 (6.8l) - Ford Truck Enthusiasts Forums