Greyheadgit

Hi Newby here for first time and have a couple of questions. I recently bought a 2013 XF Sport Sportbrake 2.2d and have noticed a couple of issues with it. One is that there is quite a noticable vibration through out the car at about 50-55 mph and the second one is a distinct throttle lag when you have been at same speed for a while when i put my foot down there is a lag in throttle response then all of a sudden bang its there. Any one had these problems and have any ideas.