07 ls2 corvette edelbrock eforce blower, stock everything else. At about 5000 rpm #8 cyl misfires about 18-35 times. By the time it gets to 5300 it quits misfiring and begins to build power again. I have swaped plugs, wires, coils, injectors, inspected the crank relucter ring, rerouted the fuel system to feed the fuel rails better, heck I've even replaced valve springs to no avail.