So I just took my 2012 focus to the dealership this week because it is shuttering. After having the car for 6 hours they told me they couldn't get it to shutter, but in the same sentence told me it was within limits. I don't understand how bad the shutter has to be before they deal with it. The car shutters so bad it almost stalls in reverse. And I get some shutter once in a while while in drive as I'm just starting to go. I'm confused and I'd what within limits is.