My banger has a miss at a constent speed. Not just on 1 cyc. but on all of them. When accelerating or pulling a hill,it smooths out and runs real good. Have a centrifugal advance Mallory on it and one 97 with a 45 jet. At crusing speed it burbles and pops,but mash the footfeed and it runs to beat hell. I've tryed all I can think of so I thought i'd see what you guys think..