I have 7570 Pfaff. I love my machine. I agree with others, use a starter piece.
My mother always used a starter piece, so to me it just comes natural.
IDT engaged when sewing keeps fabric moving easily.
Also, lift out throat plate to get any dust bunnies or thread pieces. Don't forget to clean dust build up from bobbin area.
It it has a long time since a good cleaning your Pfaff my need to see the Pfaff doctor.