I recently bought a John Deere STX38 black deck with a Kohler Command CV125S. The guy said it ran fine for the past three years he’s had it, but wouldn’t start this season. After about ten seconds of cranking with the choke on, the mower will briefly fire, but die within 2-3 seconds. I have replaced all fuel lines, fuel filter, fuel shut off valve, cleaned the tank and fuel cap vent, and and ignition module. I cleaned the carb, but have not rebuilt it. I tried resetting the carb adjustments, but it didn’t help anything. Other than this issue, the mower is in excellent condition. Thanks for any help!