As some have already said clean all the excess oil from machine and look at your manual to cleaning or maintence. Check your book on tension, threading & bobbin make sure this is right. I have been sewing for yrs. & I still check my manual book when things go wrong.
I too have a DH that is so good at fixing everything but my sewing machines are off limits to him. I too learned the hard way. lol
Good Luck :thumbup: