Originally Posted by audiblue

I haven't noticed it idling higher than I would expect. The rough idle seems consistent whether the engine is warm or cold.

The idling is rough, and the sound/noise is consistent ( I assume if it was missing I would hear a variation in the noise?). It goes away when the vehicle is in motion, and completely when in neutral.

I noticed a difference when I filled the car up with Premium gas, which made me think the wrong gas grade was in the car, but the 'vibration' returned shortly after words.

The best analogy I can give, is when you drive the car really fast on the highway, to the point that the steering wheel shakes a little. If that helps.