Growfie

Hi, This is my first post to USC. Hope this works... I have a 97 Impreza 1.8L, standard with 250,000 KM on the original engine. When is it wet, it misses and at night, I can see electricity going from my coil to the wires and between the wires. I have replaced the obvious ignition parts with new Subaru ones: new Sooby coil, new NGK wires and plugs, but still it misses. What else could it be? Frustrated, Ray