Even if you did fix your problem you should still have cleaner and lube pads they come in seperate packages with 6 in ea. pack and are $5 per pack and they last quite a while.
They will extend the life of your liner, make for a smoother feed and can improve your weld if you have excessively dirty wire.
Well worth the $10. They have them here 2nd from the last on the bottom of the page, not where I buy from but they are the same ones I buy,
https://weldingsupply.securesites.com
welder19