I would run it by a parts store and run a scan tool on it looking for any EGR codes, unless you have a box of your own. Get a paint thickness gauge for 10 bucks and run it around the body. Don't trust lying carfax.
Other than that, they are good trucks. Plan to spend 750 on a tune. Crazy if you don't
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Hi another new guy here tune as in tuner kit or a mechanic to go thru it