Maybe bad plug wires from the get go. I know of someone that had the FMS wires and they failed out of the box. He got Megnecore's and was good to go.

http://www.apexperformance.net/cartgenie/prodInfo.asp?pid=627&cid=10

-'96 SE MTX 3L -'98 SVT 1,173 of 6,535 -'05 Mazda 6s, loaded, g/f's ride -Need a 96-00 manual on CD? PM or email me