I would suspect that the "noise suppression filter circuit" in your radio has went bad. All electrical things (including spark plug wires) emite radio signals, at different frenquencies. The filter is mostly adjusted in the AM circuit to short out "spark frenquencies" It is hard to short out all frenquencies (fence row sparker, electrical transmission lines, high wattage transmitters, etc. This is not a problem in FM as it is "frenquency modulated" Charles Krammin USMC aviation radio repairman, retired
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