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becauce the muffler is (was) stopped up. If you switch of your ignition while driveing at speed, their is no spark to the plugs and the raw fuel wont explode till it gets to the hot muffler, many times this will damage your muffler, and creates a very loud backfire!

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โˆ™ 2007-10-07 05:47:34
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Q: Why would a Ford 300 straight 6 blow out the muffler?
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