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I just bought a 98 Deville with the 4.6 Northstar and there is a fluttering sound (from the exhaust I think) during acceleration, and goes away when coasting. Any one have some ideas about what I should be looking at?
 

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White Diamond '03 DHS (with DTS floor shift)
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Is it coming from the exhaust tips (misfire) or upline somewhere (exhaust leak)?
 
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