Collapsed/Failed Lifter or Not? 2007 GMC Yukon 5.3 Flex Fuel AFM/DOD

[@LiLrampage209]

Maybe if you bar the engine over and check to see if it goes up and down? Cause instead of getting stuck collapsed what if it got stuck open? Just tossing a suggestion hopefully you can get it figured out I had a Yukon similar had random misfire open it up had a collapsed lifter changed it put back together and still had issue in the end just had to get rid of it.

[@cedmac3366]

I know the actual lifters are below the heads...But you know what I mean 😎