i have a 2003 dodge ram for sale, the truck runs great but the bed was slightly damaged in a fender bender no major damage, the original owner put a v8 in it before i bought it, it had a v6 before something happened to it. the tires and rims are in good shape, the new v8 has only 42xxx miles on it as the truck body has 140xxx. the check engine light is on for a mode that the v8 cannot transfe...