Try checking your fuel tank. I had the same exact problem and found out that fuel tank was vibrating like hell inside the fuselage causing abnormal delivery of fuel. Start the engine with the wing off(make sure you cover your electronics with a piece of cloth) and check the tank.Give full throttle and adjust the needle valve as you would normally do. If you can see fuel foaming inside the tank or the tank vibrating then try to cover it with foam or anything to reduce vibration.