i have a 92 murray. i used it the other day and i cut the gas valve to off and let the mower quit when it was out of gas. i cranked it back up a hour later and it fired up first try and then i started driving it and it went dead. now i can't get it to fire back up. i changed spark plug because i smelled gas on the other one. i made sure it had spark and it did. sometimes it will try to run but then it will choke out. it back fires sometimes when cranking. i took carb off and cleaned it. still it won't fire up. what could it be?
