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I have a 2004 silverado with the 4.8. When I am in park idling or when i come to a stop, so basically whenever I’m idling it makes a weird puh puh noise. It seems to only occur whenever my truck is pretty warmed up and idling low. Im pretty certain its not an actually exhaust issue, but an issue with the engine. If anyone has an idea of what it may be, please tell me thanks.
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