My motor will fire up and run at idle then stall if I rev it up will stay running but surges up and down about 500 rpm , I have already replaced the fuel pump and install new spark plugs , the motor model is J50PL4ST , very frustrating as finally was able to get to cabin since Ontario gov locked us out for 2 months due to covid restrictions any help would be appreciated Or let me know if you need anymore info Thx Rene
