Id 319 - FAA PPL(A) USA - During the run-up at a high-elevation airport, a pilot notes a slight engine roughness that is not affected by the magneto check but grows worse during the carburetor heat check. Under these circumstances, what would be the most logical initial action?
Question id 319 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane
Reduce manifold pressure to control detonation.
Check the results obtained with a leaner setting of the mixture.
Taxi back to the flight line for a maintenance check.
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