Motor starts fine. Runs fine at part throttle. Run at wide open for about 5 minutes, then started sputtering when I came back to half throttle. Tried giving it some choke at it starts to stall, bulb is hard and give a little squeeze and it starts to stall. Feels like a misfire. Shut it off. Took one plug wire off and it ran better, but not as powerful. Took the other wire off and it ran better but not as powerful. Then after a while it wouldn't restart. Let it sit for 15 minutes. Ran fine the did it Took it home removed the carb and everything looks fine inside. Also, replaced the impeller the other day and now it has a telltale. Could it be the ignition box or stator?