[spudz]

Did you check for spark on all 8?? If you have spark on most but not 8, odds are you need a new cap.. First step is to find out what cyl/s ain't firring. Then go from there.. Once you find out what cyl isn't firing, Ohm the plug wire or swap with a known good one.. Just cause its new doesn't mean its good. Then if that is OK, swap plugs with a known good one.. If that doesn't do it.. check compression.. if thats good... THEN.......you need to make sure your valves are adjusted and push rods ain't bent....THEN its real bad... if all that is good.... you may need a new camshaft........hope this helps...