My tractor is sputtering and wont fully idle. If you give it throttle, it will sputter harder and die out. I just removed and cleaned the injector so i dint know what it could be. I only removed the injector because it was leakin diesel around the return ring. I pulled it, broke it down, cleaned it up an put it back to gether with some dielectric grease around the outer lip of the return ring to stop the leak, an it did stop but it started sputtering