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Old 06-17-2019, 07:02 PM   #1 (permalink)
windy
Block Heater
 
Join Date: Jul 2006
Posts: 19

Rattling noise when pulling

My engine seems to 'rattle' when pulling at 2500 rpm. If I back off from 2500 it stops. Recently it seems to make the noise only quieter at low speeds even when not pulling - just push on accelerator a bit.
Is this normal? And what is causing it?

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2012 2500 Duramax LML
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