Check for a buildup of lint or a thread nest somewhere under the needle plate?
Take the shuttle race / parts /whatever out, and brush all of that area out? (Flip the 2 side latches outward, and pull all those pieces out?
Failure to feed right, manual suggests:
stitch length regulator is set below Number 1
presser foot not down completely
insufficient pressure on pressure foot (kinda the same thing, lol)
sew-darn knob for the feed dogs is improperly adjusted
(also look @ feed dogs to see if they do move the full range vs. are stuck partially only up)
Skips stitches:
wrong needle length
bent needle or too blunt
needle inserted wrong way
machine or just the needle not threaded correctly
thread too heavy for needle
insufficient pressure foot pressure
bobbin is threaded incorrectly in the bobbin case
Also check those wing latches for the bobbin case / shuttle / whatever and make sure everything there is installed correctly and the latches are in place.
That's about all I could get out of the manual. Apologies if you already know all that and tried all that. I'm still new here.
Last edited by MadCow333; 05-31-2013 at 03:13 PM.