Ok well it doesn't run awful, idles great and under normal driving conditions all is good. But when I accelerate hard, it misfires and runs awful. When I pulled out the plugs it had the auto lite 104s, I put it some decent ngk plugs but I know the supercharger is stock. So my question is what kind of mods could have been done to this car that won't let it run right on the plugs I put in? The gap is correct, any thoughts? Thanks.