Hi, on a gas engine it is either electrical or it is fuel supply. Most stalling problems on 74 series tractors be it Diesel or gas is junk in the bottom of the fuel tank blocking the outlet. Not familiar with the gas engine but there must be somewhere to disconnect the fuel line from the tank by the carb. Hold a clean bucket under it and disconnect fuel line. Gas should flow the full of the fuel line into the bucket. Blowing compressed air back towards the fuel tank will be a short term fix but long term is removing fuel tank outlet out of both sides of the tank and draining and cleaning outlet valve. My brother had the remains of a dead lady bud in his fuel tank of his 684 causing fuel starvation.
First quick check is the fuel tank filler cap, try loosening the filler cap and running it.
Good luck. JimB