Too tight a tension on the rollers can cause the wire to deform and twist ,leading to feeding problems, back off the tension a bit. A piece of felt or flannel, held with a clothes pin at the point where the wire comes off the reel before it enters the rollers helps to wipe off any dirt before it enters the feeder. A new tip screwed in tight also works wonders.
Also check that your electrical connections and ground are clean and tight, I was told by a welding shop service technician that a lot of welding problems are due to poor grounding of the work piece.
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