Its sounds like the low end may be too lean. A lean low end will let the engine idle for a very long time but that is not the way it should be set. Most well tuned engines will idle for a minute or so quite well but if you hit the gas they will flood out and die. I always set mine so it would idle for about 10 seconds without loading up. A lean low end will also make the idle very erratic and sometimes too high.

A rule of thumb I always like to follow is:

Always make it richer before you lean it out. Its easier to diagnose rich symptoms than lean.