I seem to be dropping a cylinder but only after about 15mins of driving, im assuming it will either be the igniter module or a coil, im betting it will be a coil, it happened once and i drove it home, had to go out again so i left it, the next morning it started and ran fine for about 15mins then dropped a cylinder again, havnt done any testing yet but looking for other suggestions of things to check, turbo still boosts fine and apart from the one cylinder everything else seems to be good.