hello iam new i have a 68 ford f250 4x4 i put in new timing chain and gears has new oil pump brand new dist and coil new plugs wires new alt truck started right up ran good drove it around the block then it sputtered and almost died then ran smooth again a min later sputterd dies now just turns over and almost sounds like it wants to start .....need help as to what to do timing was all perfect carb seemed to be getting gas fuel pump seems to work almost seemed like it ran out of gas ...tank is full