Hey Monte

I had a problem like that with brison 2.4,with ever u go to knife edge the engine would act like it was going to stop,then a few sec after it would run normal.
the guys at brison said to check the tank but all was well there.I seems the setting on my high end needle was to rich,have not had that problem since.I don't know about your DA but that was the problem with my brison.

Verne