Okay, Recently OH mags (about 10 hr.s), new ignition wires, P leads new, NEVER an ignition noise problem, great TRIG radio in my J3.. until this afternoon's flight. Bummer! I guess I will look for any loose mag ground connections and check for loose plug wire shielding connections at plugs. I don't know! I am meticulous when it comes to wiring! Any ideas appreciated.