Short run today. Only 3 min. #1 ignition box is inop. Engine dies when #2 ignition is turned off. Swapped RG400 leads on ignition #1 control box. A to B. Would not start. Misfires. Swapped leads back to original positions. Engine started and ran normally but IGN #1 is still inop. Tracked prop. Blades match exactly. Checked engine RPM with a TruTach II. RPM verified correct on G3X within 1 RPM.