I didn't finish the previous problem. After using the mower several times without the fuel pump, that didn't seem to matter, one day it wouldn't start. Lots of backfiring and poping. I replaced the keyway that was half sheared. Now it will start and run at idle. If I give it any throttle it wants to die. I did have the carb off and cleaned it and blew it out with air. Could I have put it together with a missing gasket or seal or something like that? The carb is a walbro with a non-adjustable float.