sounds like youre probably lean on your idle circuit. Air mixture screws need to be let out a bit if I remember correctly. Max to let them out is 3.5 turns. If youre still lean, bump up your pilot and screw the air screws in and work your way back out.

Its been a while, I'm just testing my memory at this point. Someone will jump in if I got it wrong. Ian the dogg taught me this ****** a long time ago...haha.