I recently had the same issue. With a Check Engine light on. They told me that #2 & #8 were mis-firing. The problem was coming from the boot on the coil pak. The boot was swelled with oil due to a valve cover gasket leak that I had, valve cover gaskets were replaced and the check engine light came on within a week with the misfiring problem.
The garage said that the boot could not be purchased separately and the coil paks would be $114 each, while a local parts store had them for $55 each.
Not sure if that helps, but that was my experience.
Wednesday, August 22nd, 2007 AT 10:25 PM