My outboard boat motor does the same thing. When it's sitting on the deck getting flushed in neutral the propeller slowly spins. If I rev it up it spins faster, but if I put my foot in the way it stops easily.

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Dale

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel