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One of the cylinders is probably not firing. Try pulling a each plug wire alternately while the engine is running. One of them probably won't make any difference and the other will probably kill the engine. The one that does not make any difference is the one that is causing the trouble. You will have to find out why it is not firing. What is happening is the cylinder that is not firing is letting the gas flow through the cylinder and into the exhaust where it is igniting in the muffler.

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Q: What will cause a muffler to glow red immediatly after starting the engine on an 18 hp Briggs and stratton?
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