I bought an Ignitor II and installed it and every time I put the car in gear it would stall. I call Clarks where I bought it and the tech told me to run a 12 guage wire from the switch side of the starter to the plus side of the coil. I did this and the car runs good now. So you don't have to change the plug wires, just run this wire. I hope this helps other Igniter owners. silverbullet652004 65 coupe 110