i was cutting a lawn yesterday when my mower suddely acted like it was about to run out of gas, then within a second or 2, it fired right back up to normal operating rpms. As i cut the lawn, it did it maybe 4 or 5 more times periodically. each time that it did this, it never actually stalled out, but acted like it was going to, then fired up again to normal. any ideas what might be happening? as always, thanks in advance for your help!