1996 Ford F-250

Ford 300 engine. 4.9 l inline 6. Great engine. Bought it with a cracked head so I replaced it and put a new radiator in. Replaced master slave cylinder cuz it was leaking. Installed a Bluetooth radio receiver. Speakers work. AC does work in the vents on the dash below the windshield but not in the other vents. Not really sure how many miles are on it. The odometer says 84,000 but I'm pretty sure that's not right on the title I have it says "exempt". The body is in great condition, it's a very pretty truck. The main issue thats left is the scanner reads "lean", meaning there's too much air in the combustion cycle. Could be a vacuum leak or a sensor. Truck could use some TLC. It runs and drives, just gets "bogged down" cause of the lean fuel mixture and backfires sometimes. This comes and goes though, and it's probably an easy fix.