Edit: Problem resolved.

I am trying to resurrect my mom's old Singer (Model 758), but I'm having a problem. It seems like the fabric is not feeding through the machine very well, so I end up with bunched up fabric around the stitches. If I pull the fabric taut with my hands at the front and back and sort of pull it through the machine, I can get nice stitches, but this is not an easy way to sew. I tried adjusting the pressure dial for the presser foot, but this did not help. I am new to sewing, so maybe there is something I a missing. Any advice would be appreciated.