I just recently replaced my plugs, wires, cap, rotor, and coil. Now all I can hear over the stereo is the interference. Ive checked all the grounds, theyre all solid, albeit a little old and dirty but solid. I even installed an inline noise filter on the power line for the stereo. Didnt help. I can hear the interference on the radio, cd, and even auxiliary. Any ideas as to what it could be and how to fix it?