i replaced the spark plugs on my 302 last week because it was starting to run rough at idle. i found that all the plugs on the passenger side had the wrong gap, (PO doofus) so i figured i had found my problem. well it seemed to run better but not really. i cruised around tonight and the car kept surging and idled really rough at stoplights, neutral seemed to be a little better. well i got home and popped the hood in the garage and turned the light out. guess what?... yep a nice half inch arc from the #8 plug boot to the header, flickering like a blinking beacon. it looked like the heater hose was pushing the plug boot against the header pipe, but the hose can't be rerouted, i suppose i could wire it up or something. does this signify a bad plug wire/boot? or do i just need to make sure that the plug boot, whether new or old, is not against the pipes? right now i think i'm just going to replace all the plug wires. or should i just replace that one wire? or just the plug boot? if that one is old and failed i suspect the others may not be far behind.