Could a mig gun cause a MM251 to weld, sputter and pop, weld, sputter and pop again? When it welds it welds good for a few inches. IT's stutters on starts too. The machine is like brand new, it's only had one 33 lb roll of solid wire through it. it's getting worse, I could deal with it before today, but today was the last draw.... it's almost 44 mag time.