I've been having a constant battle with a misfire on cylinder 1. I've changed plugs and that didn't seem to help. I took the plug out and checked it and it looked fine, made sure that everything was buttoned down nice and tight. CEL didn't come on for a few days and then it's back on. The car seems to run fine and there is no noticable stumble or anything when the light decides to come on. I'm thinking about swapping out the coil pack with another cylinder and see if the misfire moves. Any other tips, ideas or comments you guys can come up with?