It all started when I went to go pick up a motor near orlando. The car started missing in a cylinder, chunging but not to bad, then over a few minutes it got worse and worse, 5 miles later I have no spark on #4 cylinder. Pulled the injector clip and limped her home on 3. The plug wires were Magstar 8.5mm wires. When I got home with the car running I pulled the plug wire out of #4 and noticed it arcing between the head and wire.

I bought new plug wires and it went away, seemed to run better then ever. A day later and it feels like is running weaker again, not much low end power at all (not the b16's have any ), but a little chuggy under 3 grand. If im in 5th gear, around 50mph or so, and get on the gas, it starts missing and chugging a just a little. But if I go down to 3rd and run her hard there is no problems.

What is this? Bad Ground?