I have a 1978 235hp evinrude i have new power packs and i found one cylinder with no spark using my timing light and another cylinder had a hit and miss spark. I had some extra coil packs laying around so i swapped the coil pack out got good spark but now the cylinder above it went out. put another coil pack on that one and one on the other side went out what's going on any help wopuld be great thanks.
