Welcome to the forums! Will it still start and run at all? Or does it just keep starting running for alittle bit and shut off like it was before everytime? We need more info for sure. Always start with the easy stuff first. Fuel, spark, and air. I would change the fuel, put a new spark plug in, and clean the air filter for starters. Since that is just easy mantainance stuff anyway that most likely could use some attention.