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Re: Slow 02 response 2013 Silverado 5.3 4X4
Posted to Technical Discussion Forum on 1/22/2020 34 Replies

The PCV valve is in the left rocker cover Louie. If your trims are good and no exhaust leaks can be found I would be leaning towards the sensors. Might not hurt to check and see if there are some software updates also. Login to read more.

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