I have this same problem also. I bought this cil after a friend di also. He was able t fix the hum in his car buy removing the stock plastic cover off the stock coil and istlling it on the MSD. I tried this withmine and it didn't help.
Just a thought.
Hope this helps!
Fred
http://fastfreddy.stangnet.com
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87 LX50 Convertible - ProM conversion - Ported Cobra Intake - Ron Anderson TFS TW heads - TFS Track Heat Cam - 24lb injectors - Kenny Brown chassis kit - Motorsport Springs -Steeda 17x8.5 Wheels - Light bar - etc...
http://fastfreddy.stangnet.com