I assume you are able to light the burner. Maybe you just don't like the noise. Perhaps asking the obvious before the burner experts kick in, but here are some ideas:
-- Have you changed the fuel/air ratio by moving the jet with respect to the air holes in the mixing tube?
-- Is there contamination inside the fuel /air mixing tube? (some sort of particles)
--I know you said you changed jets, but are they both free of soot in the orifice? You can blow compressed air backwards into the jet, and/or soak the jet in solvent. (I use a tiny wire, but people say you can damage the orifice)
-- Are you using a different fuel mix for the first time, like 70/30 butane/propane where before you had pure butane?
-- Is the valve on your fuel tank the same as always? Can you attenuate the gas flow and still get the stuttering?
I know there are mysteries here. Good luck chasing it down. BTW, what's wrong with having the stuttering noise? Is the flame "tuning" still to your satisfaction?
-Carl