JustBobbysgirl

Hello,
I'm hoping to find advice about free motion quilting. I used to use an old Brother machine and for the most part it worked nicely. I was given a Viking "Lily" that is computerized and have made several art quilts with it. But, it doesn't move smooth as butter, like I've seen other machines move. The feed dogs are down, yet no matter the speed, it has a slight "ker-chunk" feel to it. I recently had it serviced and it is running fine, but when I've watched videos online, I can tell that those machines are moving without any drag whatsoever. I'm wondering if I need to upgrade to a better machine? If so, what price range/or machine would be good?