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Discussion Starter · #1 ·
I have a 1999 sierra and when I accelarate the knocking reduces. When I reach cruizing speed the knocking gets louder. If I take my foot off the gas or press down the clutch the knocks gets louder. At 45mph the knocking is accompanied by a whooble. The knocking sounds like it is under the drivers seat or behind it. Nothing looks loose under there. Any ideas?
 

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What the hell is a Sierra?!? And a whooble for that matter?
 
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