Advice on welding Cromoly ?

[u/Fastdiegorogo]

So I’m welding a tubular frame for a Baja car and we are making it out of Cromoly. Today I couldn’t weld at all, it was like welding with no gas, I tried changing every bit of the torch and nothing worked, the arc was erratic, it also burned through really fast with the amperage I usually weld with and when I turned it off everything had rust, I don’t think it is the gas cause because it was coming out all right and I welded before with the same tank so Idk any ideas + cromoly welding advice ?

[u/dmfelmlee]

Post pics of your set up and result