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Welcome to MLF pollecy! 
Have your tried disassembling the carb and cleaning it out yet? That might be a good place to start as there could be one or more of jets partly plugged.
Some information on doing that here:
Overhauling the Carburetor | Frequently Asked Questions | Customer Support | Briggs & Stratton
Mixture and idle screw settings to get it to run long enough for final adjustment are typically 1 to 1 1/2 turns out from lightly seated.
https://www.briggsandstratton.com/s...d-questions/Adjusting idle speed and mixture/
Have your tried disassembling the carb and cleaning it out yet? That might be a good place to start as there could be one or more of jets partly plugged.
Some information on doing that here:
Overhauling the Carburetor | Frequently Asked Questions | Customer Support | Briggs & Stratton
Mixture and idle screw settings to get it to run long enough for final adjustment are typically 1 to 1 1/2 turns out from lightly seated.
https://www.briggsandstratton.com/s...d-questions/Adjusting idle speed and mixture/
