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Mine was doing the same thing, and it turned out one of the plugs was not firing, which turned to be not the plug but the coil for that side (Briggs & Stratton 18hp on an MTD 1650 lawn tractor)
.030
.30 thousands
What is the gap on the spark plug on a Brigg's stratton lawn mower Model#31P777 Type 0348E1?
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not getting fire 4.75 briggs statton lawn mower
A Champion CJ8Y or J19LM will perform fine
.32
You can set most plugs at .030 and be safe.
underneath where the blade is you will see a plug. that's it
Brigg's and stratton 5.5 hp on the craftsman push mower your gap tool set the gap at .025-030 for briggs 5 hp
The Briggs and Stratton part number for a standard spark plug is 496018S. You can either buy this exact plug or call around to local lawn mower shops or auto parts providers (NAPA, O'reilly's...) and get them to cross reference the part number to see what other plugs will work.