I'm having problems with cylinder number 4, its not firing. I have spark (checked it with the old screwdriver trick) and I have fuel because I can see it on the top of the piston. For some reason it is not combusting. I don't know why... I haven't done a compression test yet, and I know it doesn't have any bent valves because It was checked by the machine shop. this is an Ls vtec w/ a gsr head, obd0 currently. any help or pointing in the right direction in appreciated. -Ben