While you wait for answers, we may have found some information which could help you.
Click here for Sewing Machine SlowPfaff Creative 1473 Thread stuck in bobbin race?
where?
Can a faulty bobbin hook cause my sewing machine to skip stitches?
Pfaff Creative 7550 sewing machine stuck in slow mode?
Pfaff 1469 Creative - skipping stitches - timing issue?
how can i remove the top of my pfaff creative 1469?