We may have found other answers which could help you.
Click here for Spring Mower Backwhat causes my Briggs and Statton petrol mower to hunt ?
lawn mower engine hunting?
Just overhauled 16 hp Briggs ans Stratton engine ?
How to fix a problem with briggs&stratton hp407engine?
lawn mower briggs and stratton classic 35?
Excessive Compression?