sjdal,
I think I would take the screws out of the stitch length cover plate, and make sure that everything in there has plenty of oil on it. Just remove the screws and let the little brown plate dangle on the feed lever, tip the machine back, and peek in there with a flashlight while moving the feed lever up and down slowly. Be careful not to get the dangling plate in any kind of a bind. Then put oil on everything inside there that moves.....or even if it doesn’t move. Oil everything in there.
CD in Oklahoma