Es350

new to forum just ran our Rancher first time since sitting through winterhad it warming up while I raked leafs it died while idling it was low on gas so I added the last gallon I had from the snowblower gas good gas and tried to start idled for a couple seconds wouldn’t take any throttle and died again and back fired tried to restart and it wouldn’t start and when I stopped cranking it over it backfired again letting it rest now and will check plug tomorrow