Erratic Idle was a member of Monty Python....
But seriously, mine does the same thing. I think it is the nature of the beast. It seems to get better with age and miles and mods. I now keep my idle set around 1100-1200 rpm and it will still rise and fall sometimes but it never stalls. Synch'ing the carbs seems to help a bit. If you want to borrow my Carbtune, let me know.....
