Did this problem start after you made all those mods or has it been going on for a while? You might have to back-track everything you've done to find out what one thing is causing the problem. I think there were some past threads on Magnacore wires misbehaving but I'm not sure. Maybe they were on the FMS ones. Hot air into the intake would be my first choice and misfiring plugs due to the wires would be a close second.
Karl
