Maybe it just needs new carbon brushes. My Bernina 830 Record resembles the Pfaff very closely. I had issues with the motor stuttering. Changed the carbon brushes and it runs like a top!
PFAFF Mail Repair Garry Machine
http://www.ebay.com/itm/Pfaff-Hobby-301-420-Serger-Overlock-Service-Repair-Manual-/171310126409
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