I just purchased this same system(used) and am having problems with skipped stitches.....I have re-threaded, changed needles, changed thread, checked that layers were not too tight, as I am new to this machine I am out of things to try. I have been searching on the net and haven't found anything new to try...if the timing is off would it sew beautiful stitches for a few inches then skip about half an inch at a time? I took off the cruise control and skipped stitches are the same.....any ideas?