ok awesome. wasnt sure if MSD or similar do a coilpack I could retrofit or something. basically, we have these... 195psi in each 6 cylinders, 20 deg of timing good oil pressure, good fuel pressure, tried 2 sets of spark plugs, one being the factory Iridiums, and the other being copper plugs, it does the occasional bang, but just wont fire (and start up) ... but when it does backfire, its a 2m flame and people in other workshops come out because they think a car has crashed haha. the spark is just weak, but its not the plugs, so unless im missing something obvious that ive overlooked, im looking towards coilpacks.