back firing trouble

you have an old car back when they were new they required a tune up about once a year just to keep them running good on the street and much more often if you went to the track to day the gas we have is sh#$%tand a tune up will not last one of the signs that a tuneup was needed was back firing in the exh or as we called it shooting ducks just do a good full tune up (points a cap rotor wires and plugs)will in moat caces thak care of the problem OLD SCHOOL