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Hi all, I have a 21 hp briggs , it will start but only idles low for a minute than shuts off, I replaced the carburetor and spark plug. I can't figure out what's wrong with it, any help is appreciated. Thanks

Post all information from engine: model xxxxxx, type xxxx, trim xx, code xxxxxxxx, thanks Mark
keep your old carburetor. post model & serial #'s from under seat.
Use OEM B&S Parts.
SEPW is a reputable business as are others, purchasing cheap knockoff parts will not work. Recheck model number under seat, not listed at website: Sears Parts Direct, thanks Mark
Tune-up Kit for your engine above.

Engine model 331877. 1234. B1. 081218ZD.
Under the seat.
Model. 944.609210.
Ser number. 050809D. 002301