My Jet 22” scroll saw started sputtering mid cut. It’s like something was holding back. I thought it might have been the speed control switch or circuit board so I put new ones in it. It’s still doing the same thing with the new parts. When I push the foot switch nothing happens but if I push the lower jaw with my hand a little it will start going but still acts like something is holding it back. It will make a few strokes then stop. I’ve cleaned and blown out every crevice but still nothing. It’s only about 4 years old but I looked over the brushes anyway. Could the motor be shot? I’m at a total loss.