Was mowing with my troybilt pony when it began to make a noise then was backfiring through the carborator (my son says). It will still run but it stalls out.
How can I remedy??

Hi,
Firdt guess ,if it is a recent model Briggs with an OHV engine, then do a valve adjustment. The procedure is on YouTube at:
Lawn Mower Repair Valve Adjustment - YouTube (http://www.youtube.com/watch?v=NjzX-PUjKmo)
Peace,
Clarke