This also is happening in my car, just like you describe. With the clutch fully depressed at idle I feel a light pulsing through my leg from the pedal.
I just got my oil changed today at the dealership. I asked for ester oil, which I have been using since I got the car in January. They accidentally put conventional oil in it, and I had them change it back to ester oil . After they finally finished, I got in the car and had this exact problem. I doubt that this was a result of the oil change, but I sure don't remember feeling it before. It seems to happen each time I start the car, but go away after I rev the engine up. I agree that it probably isn't serious, but it is annoying.
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