I have a kenmore machine that has worked pretty well learning my machine quilting. My question is for some reason I can not get it to go slow like it did before. The speed is controlled by the foot peddle. Is the foot peddle something that could not be working properly and that is the problem? In the past I could work the peddle to go really slowly, a stitch at a time. Now it goes full speed ....... Very frustrating. Any suggestions?