Mach 460 radio interference

[IdahoStang]

OK, I hope someone can help. I hav a 94Mustang GT ,,,have only had it a few months now,,,, suddenly I am getting radio interference from the engine,
just wondering where would be the first place to look. It still has the factory Mach 460 sound system

 

[iskwezm]

that year had a problem with the radios and Fords fix was to replace the cap and coil with new designed parts that had brass contacts. that fixed about 90% of the cars i worked on at the dealer.

 

[94GTCoupe]

i own a 94 gt with mach 460.the radio had a buzz that increased with engine speed/rpms.turned out to be bad spark plug wires.check the wires plus the ignition coil to distributor cap wire.