Hi gents, I'm new to this forum. I've just bought a Sealey super mig 130 but I've got an issue with it. The gun keeps jumping regardless of what voltage or feed speed I have selected. I'm using CO2 with a pub gas size bottle. Could this be the cause? The gas is coming through when I squeeze the trigger. I've set the gas flow to just about audible when the trigger is depressed. Cheers Daz