i just got a toro super recycler with a Briggs 6.5 intek. Cleaned the carb bowl and jet, new fuel and spark plug. The engine runs good but will randomly “pop” for no reason. Is this just the state of Briggs, or could there be something going on? It only does it under no load conditions. The air filter seems okay. I remember the old flat head Briggs all used to pop...it’s annoying.