If it's your gimbal bearing or U joints, it would do it when turned too. Does it?
Does it feel less powerful as well? A misfire could easily vibration under heavy load (like when you are transitioning onto plane. Plugs, wires, cap and rotor would be a good start, if it's been awhile since they were changed.
It is possible for the engine to be out af aligment with the drive. The alignment is supposed to be checked every 100 hours, if memory serves. Since the drive has to come off to check the aligment, the U joints and Gimbal bearing can be checked at the same time. It's also a great time to remove any corrosion, then prime and paint the bare parts of the drive.
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