What brand/model machine is it? If it is an older "mechanical" machine, ie early 80's or older. It probably needs a good cleaning and OILING. The old oil may have solidified over time and the motor is having difficulty moving the parts that are semi-frozen. Continuing to run the motor against the resistance could burn out your motor. Take it for service or consult your manual on how to clean and oil.; Use good quality sewing machine oil, NOT 3-in-1, WD40, or cooking oil.
Have it serviced as there may be build up of fluff jamming the moving shafts
during the service the operation of the motor and speed control will be checked as well
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