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In a manual trans, there are parts rubbing against each other even with the engine in neutral.
The drag for the oil (which is worse when cold) will exert some torque on the gears even when they are not engaged.
This is in the needle bearings between the gears and the drive shafts.
This is normal.
Now if you said it was doing that with the clutch disengaged then you have a problem.
If you start a man trans car in neutral on jackstands, the wheels WILL begin to spin up but you can stop them with just your hands.
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