I would check the body out for dings or rust. Then check the engine and look for any leaks or faulty parts. Listen to the engine and see if there is any wierd idel sounds. Also check to make sure you can turn it off in park after driving it because when i got mine i didnt do that and it hasnt been able to for a long time without making a diesal sound or backfiring. I am no expert but i would ask 5-8 chevy or low84 those guys know their stuff. Hope that helps a little my friend.