Sewing pedal control or something else?
Took machine in because of foot pedal, but of course cannot make it fail in the shop. He suggested new controller/pedal. But I didn't want to drive 50 miles out of the way, so ordered from SPO. I chose priority shipping, and it came within a few days. Got brave and tried out after a couple of days and now everything is smooth. No jerking starts or stops in mid seam.