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International Automotive Technicians Network
Re: Slow 02 response 2013 Silverado 5.3 4X4
Posted to Technical Discussion Forum on 1/22/2020

Hi Louis,

Start the engine cold and spray water in a stream from a water bottle down both sides of the intake mounting area. If you see excess steam out the tail pipe has you spray it, it has a weak intake gasket.

This is a very common issue on these engin... Login to read more.