Try the process of elimination. Take out the needle, take off the needle plate, take out the bobbin case. Run the machine. Does if run full speed? You might have to let the machine run for about 5 minutes. If it runs slow or you hear it slow down, you might have a bad connecting link between the needle bar and the main shaft counter weight. They seize up sometimes. (Shop Repair).
Testimonial: "Thank you so much for your advice. I am taking to repair shop this week. It is a great machine. Thanks again~~Patricia~~"
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