My Kenmore computerized sewing machine started acting up yesterday. I would take my foot off of the petal and it would still keep going. Any idea what I can do to fix this or should I just take it in to be serviced? I've had this machine for a little over a year and have used it lots so maybe I should just take it in but I really hate to put out the money if it is something that I can fix myself and I really don't want to be without my machine for the time that it takes to fix.