miller 225D skips

I have a miller 225D with less than 1,000 hrs while burning 7018 1/8" it will stick the rod your welding along good about 10sec it just stops or burps for a spilt second and then goes back to welding some times it will stick sometimes right back to burning rod . it done the same thing to my mechanic when it was on his truck . we put a new fine adjustment on it because it had a dead spot. it's very annoying :Banghead:Banghead

miller 225D skips