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Thank you for the responses. I thought I had a blown head gasket, so I removed the cylinder head to check. The gasket looked perfectly good, so I concluded that wasn't the problem. I replaced the gasket and adjusted the valve clearances at the same time. I will get some carburetor cleaner...

I have a B&S 15 hp Intek engine (model 31R777) in a Snapper riding mower. When cold, the engine starts, and runs well enough to mow the yard, although there are occasional misses. However, the engine will not idle. When the engine is running and I move the throttle from full speed to idle...