I had some bad fuel in my tank that got ran through the system until the engine started to struggle and I shut it down. I drained the fuel tank flushed it several times till it was clean fuel coming out replaced filter and squeezed ball with line to seperator off until fuel ran clean. It started and I used it for about fifteen minutes and it ran fine. Then I went to move snow and it started right up and ran fine but the exhaust smelled bad like unburnt fuel and it seemed to loose a little power but still ran good. Should I do something else to clean the system? Are the injectors fouled from the bad fuel? Should I add some injector cleaner or fuel treatment to tank? Additive brand suggestions? Thanks for any help.