Could be the fuel pump. I assume this model has primary pump before the injector pump?
Next time it does it, pull the hose off the injector pump inlet and see what kind of flow you get from the primary pump.
If it's a mechanical pump, you should get a strong, air free shot with every other revolution of the engine.
If it's electric, with the ignition on, you should get a continuous, air free, full hose stream.
If you get air, intermittent air and fuel, check for rotten, split, loose hose connections, loose pick up tube in tank. Air is easier to pump than fuel. This could also be a bad pump.
If you get nothing, could be gelled fuel, bad pump, clogged strainer in tank.
Pull the hose on the pump inlet, see if you get suction. No suction, bad pump.
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