I have a 258 eith the one barrel carter and it must be out a tune, because it backfires under aceleration and flames shoot out the carb. It runs fine at idle after it starts, but if I try to acelerate a little it bogs and then something pops or releases and a flame comes out the carb and it dies. Does anyone know what it is ,I need help the choke is messed up it stays open and i know it needs to close to start in cold weather could this be whats causing the flame. This is a total guess but could the choke get stuck while reving causing a great amount of gas to build up and then the choke flys open and the mixture is way to rich causing it to back fire and shoot a flame. I just want to figure this out.