If the muffler on the lawn mower is blocked, the engine will run rough and/or die. The engine stalls because the it cannot expel burnt gases that build up as it runs.
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Pamela Gardapee is a writer with more than seven years experience writing Web content. Being functional in finances, home projects and computers has allowed Gardapee to give her readers valuable information. She studied accounting, computers and writing before offering her tax, computer and writing services to others.