I am looking at a '03 2500 turbo diesel and was wondering if it has any major problems. At least for that generation or year specifically. Anything i should look for or feel for while test driving. It has .... - 5.9L 24v Turbo Diesel -163k M - AT Tires - Single stack exhaust Everything else looks stock, im not to sure and this is my first "Truck" truck. along with that i was wondering was would be the best tuner for MPGs.