What is initial timing and what is advance all in? What rpm does the advance come in at? What rpm are you cruising at? Maybe a plug pic? after a steady cruise pull over and pull plug
Have you adjusted the idle mixture screws to make it run little rich see if that helps?
I haven't checked all in timing... I know I know. cruising it at 2000ish. low speed, no issues there, its just off idle pop. ill post a plug pic later today
