While you wait for answers, we may have found some information which could help you.
Click here for Sewing Machine Sew
How do fill a bobber?
How do I troubleshoot a Kenmore sewing machine 1972 zig zag?
Why won't Sears Kenmore 158.14001 stitch length turn?
Kenmore 158.14001 Stitch length knob now turns, won't change length?
Sewing machine needle won't move when I step on foot peddle but moves manua?
What size motor does this model have 158.14300 ?