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try all new gas in both plus some fuel injector cleaner and new spark plugs and i bet you will be fine
i would agree that the one that ran then died might have a gunked up carb but i have never had gas last that long. try looking at some videos on youtube of cleaning small engine carb. if you have to or decide to clean the carbs get some carb cleaner from a place like napa
did the one that backfired and quite blow out a bunch of smoke?
The one that starts with a shot of fluid is a piece of cake. Remove and clean carb. Put back together with new fuel.The other, since it ran, then died could be a multi tude of things. Id start by replacing plug and cleaning carb. How many porcinins could I get in pay to get them going?