A slight ping or cough at low rpms once in a while has been normal with mine. With stock maps, sport maps and even custom maps.
With my Lemans Im running a closed airbox with K&N, Mistral crossover, Mistral pipe and custom Guzzitech map. 91 octane.
My Scura has an open airbox with a K&N, Guzzitech crossover, M4 pipes and a custom Guzzitech map.
Try to stay away from ethanol.