You push the throttle full forward too quickly on a carbureted engine, and the engine sputters.

This engine gauges DOES NOT give you a good idea of your engine's operating temperature?

This causes the electricity from the magneto's primary coil to flow through a ground wire (the p-lead) to the aircraft's fuselage

You lose a little power because your cylinders burn fuel less efficiently with only one of these operating.

This causes your RPM to drop and your mixture to enrichen.