I've had the same problem going-on three years...and no one can figure-out the problem. I've had three NEW throttle bodies put in, eight new coils, and still the hesitation/slight miss problem occurs. It actually goes away for about 13-months after a new TB, but that gets rather expensive since Jaguar doesn't replace it for me on warranty.
I'm at my wits-end on this...
I just had a 100,000 mile check-up; new plugs, belts, the works...including all new coils.

Any ideas on what I tell the dealership to look at next?

 

Don't bother with the coils...I've replaced all eight in the past 12 months and the problem still exists. I am taking my car back to Atlanta in the near future and let the dealership have it for a week to see if they can duplicate the problem and come up with a solution. I will let everyone know if it gets fixed.
Again...don't waste your money on coils; I've been that route. As I said in my earlier email: it is rather suspicious that a throttle body replacement always cures my problem for about a year. This all started with Jaguar recalling the TB; I never had the problem until the recall.