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With aircraft reciprocating engines, the FAA instructs that the proper way to shut the engine down is to close off the fuel and let the engine run until it stops. There is a good reason for doing it this way.
When you 'choke the engine to death'
your introducing too much fuel into the combustion chamber. It washes the oil off the cylinder walls, which increases ring/cylinder wear at the next start up. The extra fuel can also run past the rings and dilute the oil in the crankcase.