If your sewing machine starts to sew too fast or too slow, it's time to adjust the speed. This is called surging. To do this, you'll need to access the speed control knob on your sewing machine. The knob is usually located on the right side of the machine, near the needle.
Turn off your sewing machine and unplug it from its power source. Then, take off any fabric or thread that's currently attached to the machine.
Now, find the speed control knob and turn it until the pointer is aligned with the 0 mark. Once you've done that, plug in your machine and turn it on.
Now slowly turn the speed control knob to the right until you reach your desired sewing speed. If you want to go faster, keep turning the knob to the right; if you want to go slower, turn the knob to left. Once you're happy with your new sewing speed, start stitching!