That's a slick looking ride! I love the leather in the King Ranch vehicles.
Not to be a downer, but I have an '06 F150 that I bought last year, and found out that the 04-08s in several models (Expeditions included, I'm almost positive) have an issue with the spark plugs essentially being "2-piece".
If it has anywhere near 100,000 miles on it and has the original spark plugs, then be sure to read up on how to remove them without breaking them off. I did mine myself without breaking any, but it was a real chore and took me about 7+ hours over 2 days. The shops charge an arm and a leg to change them.
Hopefully your plugs have already been changed, or maybe you just won't have the same sorts of problems.