I cranked my mower yesterday morning with little choke and gas and she fired right up. Started cutting and had a little issue on a slope (drive tire up hill) but it caught and sputtered a little. I figured I was low on gas and turned onto the driveway and headed back to the carport to fill up (it ran ok up the drive). After filling it would turn over but not fire. Good gas about 2 weeks old and I have cut 2 times this year already with out problems. Pulled the plugs and they have fire. Shot a little ether in both cyls and still no fire. Battery is charged. Air filter is currently off and not restricting. Any ideas?