Its the coil pack mate
im bilding a focus cosworth and we started it up for the first time about 4 weeks back and number 4 was not running right it was sparking but not firing the plug when it was in the head so i put the coil pack on the wifes KA and that run the same . i put a brand new one on and it ran spot on
Last edited by COLEYST200; Sep 14, 2012 at 05:19 PM.