First question...How old is your machine ....depending on their age, they are worth their weight in gold.
Have you had it serviced, your pedal could just need servicing or possible replacement. I know the 'new' machine look so nice and shiny and new....but the lower end ones (IMHO) are made to be disposable. Find a Sewing Machine service center, take your machine in ask questions, ask questions, ask questions....How much for a simple service, repair of pedal or replacement ( I just replaced mine on my Brother for $50) but I am guessing it just needs to be taken apart and cleaned. You can go on the Singer website and age date your machine, so you have some accurate
information in your head.