I have exactly the same problem and it's getting worse. Mine's '08 with about 4500 miles. The engine used to shake a little for like 10 seconds on fresh starts for a couple of years. Didn't do any more than that, so I let it be. But these days, it sometimes shakes like there's a storm outside and this one time the rev needle moved up and down like so crazy when started in the morning. It's in the dealer for service for over 10 days now.