Clogged fuel filter? Clogged injectors? Bad gas? Water in the gas? It shouldn't be an air issue and I wouldn't think it is a spark issue either. Sitting for a year (assuming with gas in the tank) isn't ever ideal. If that gas had ethanol in it that is even worse. Did you drain the tank or are you trying to burn through the gas that was in it? Ethanol attracts water like a sponge and from what I understand gas with ethanol in it is more prone to break down over time. Drain the tank to get the old gas out of there (if you haven't already) and start with fresh gas.
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