Hey guys. Just bought a 1989 Z28 with the 305 tbi engine. Only real problem it has is the fan relay sometimes keeps the fan going after its off. As the title says, sometimes it stalls randomly. There is no gas cap on it so maybe its leaking some gas?(wild guess), but i also contacted my friend who sold it to me and he said that when theres a quarter of a tank left it begins to do this. He said to get some air cleaner and fill it up with gas. Is there anything else i can do so it wont stall when its at a quarter left? Thanks for the help.