I've got a 2004 kawasaki stx 15f jet ski. It doesn't have spark in cylinders 1 and 4. If I switch where the coils plug in at I can get 1 and 4 to spark but not 2 and 3 so I assume my coils are good. I've replaced the spark plugs, cam shaft sensor, crankshaft sensor, new battery, tried 3 different ECU's and can't seem to find the problem. Checked over the wiring harness too and not seeing any corrosion or bad wires. Any ideas?