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Just bought a 2014 XLT with the 3.5 and it's doing a slight shudder sometimes around 70mph or so. It has 160K miles on it so I was told it's probably the plugs causing it, but not sure if thats correct info.
 

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Just bought a 2014 XLT with the 3.5 and it's doing a slight shudder sometimes around 70mph or so. It has 160K miles on it so I was told it's probably the plugs causing it, but not sure if thats correct info.
Without a vehicle history, that's probably anyone's guess. It's a cheap and easy thing to do, start there, report back.
 
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