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thump in engine 2009 avalanche

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Old Jun 8, 2015 | 5:24 PM
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jnyhuis
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Default thump in engine 2009 avalanche
I have a 2009 avalanche lt. I just bought it. The idle is a little bit shakey and it idles at one tick above 5000 rpms and then there is a thump and a change in idle noise every 3-5min. It's a very noticeable thump. What could be causing this. Am I screwed?
Thanks in advance.
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