stalling

[Ivan141]

Not likely to be ignition timing, it's more likely to have starting problems in that case (at least if it has too much advance).
I once had this problem on an engine that had broken pistonrings on 2 cilinders, not saying that's your problem in this case though.
You can rule this out by pulling the crankcase ventilation tube off the valve cover, and give it some throttle. If it blows smoke out with some force, then your in trouble.