reason why i ask is mine did this for a bit after installing the first and second set of toms carbs. I had debris in the bowls and jets that would work its way up and stop it from running just like that in traffic. Its the debris from when he punches holes in the tops of the carbs to vent the bowls. Both times i thoroughly cleaned them i found the same metal bits stuck in passage ways. BLOW THE LIVING CRAP OUT OF THE JETS as they sit installed with a air gun after removing the top half of the carb. Put a rag over the rest so the fuel does not shoot up at you and you also might find some metal chips when finished.
