When you push to the right on the needle bar is it sticky? Look and see what the needle bar connects to. Do you see any kind of thing that goes in and out of a sleeve or pin? check to see if it is gummed up. Then you will need to lift the top lid and when you push on the needle bar see what moves under there - cleaning out the gunky oil will do some good there too. You will need to go over every moving part on the machine and free it up with the oil. Avoid 3-in-1 oil like the plague - it may be what is in there now.