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HELP!!!!! 1999 Engine 54L backfiring

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Old 02-20-2000 | 10:48 AM
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Joined: Jan 2000
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From: Lawrenceville, Georgia
Question HELP!!!!! 1999 Engine 54L backfiring
My 1999 5.4L Expy is backfiring. What causes backfiring. It sounds like a hot rod car. No big boom but alot of manifold sound.
Any ideas?
 
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