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engine loping( chugging)?

I have a lawnmower( craftsman) with a briggs & stratton 3.75 sprint engine. It starts good, but lopes (chuggs) . The idle goes up and down, it does not die, but wont run at a constant idle. I ve tried using carb cleaner and running sta-bel thru it, no change. Tank is clean and pickup tube seems clear. Thanks
Tom, May 2012
Almost guarantee that it needs a new carb diaphragm. Easy and cheap.

phil_saunders(a)bigfoot.com

Phil Saunders, May 2012
How old is fuel. Last yr, possibly gone off, try fresh

SD, May 2012
link Click here to see other fixes for Briggs & Stratton 3.75 Sprint.