hi, my old sealey 180/1 is pulsing its wire feed, not stopping and starting, just slowing down and speeding up, it takes about 1 to 2 seconds to do one pulse, all other functions are normal. it had a new speed controller about a year ago that's to say about 10kg,s of 0.6 wire ago, but only just started misbehaving yesterday, any thoughts gratefully received, fred.