My novarossi m12 doesnt like to idle or run very well. I even took it to the hobby shop where it still ran spastically. Im wondering what this could be..I replaced the fueil lines, but it still seems to not want to start up good. If i cover the exhaust to get some fuel to the carb, it will start. But then it cuts out again. Im thinking maybe my tank has an air leak or my fuel is bad(left in my car 1 day, but the motor still start just runs like ****) or sumthing relativley simple or that sort.. Any other opinions, or suggestions to help make this motor run better?

Maybe your carb or backplate has an air leak.