jurick

My friend has an Ultimate !! machine, and it seems to work great except when he tries to work on a t-shirt quilt, For some reason it starts skipping stitches a lot and can not quilt without skipping. We have tried different needles, thread, and lots of things, but it isn't just the areas of the t-shirts that have more texture to them. I was wondering if raising the foot would be of any help. It doesn't seem to drag or anything, but just trying to troubleshoot anything that would be helpful. Thanks in advance for any suggestions.