Unfortunately, I have experienced this as well. Mine doesn't idle rough all the time, just occasionally. I can definitely feel a little to much shaking at 750 rpms. If if I turn my AC on, I can watch the needle go from about 770 rpms down below 750 to about 730. When it goes below that the car shakes a little and goes back up. I doubt this is normal, but I will be taking it to the dealer in about a week for other little problems and I will ask them about it. Anyone else?