So my 3.3 won't stay running,, have completely retuned the carb and all,,,, sadly I hear a strange noise from the engine,, I think I might have sucked in a small rock last time I changed out plugs,, it starts but will only run a few seconds before it dies,,not a big deal really these Traxxas engines are super easy to rebuild,, thinking about buying a couple of more engines just to have on hand