2017 Yukon 6.2 suddenly running very rough and check engine light

buddy had a silverado about 4 years ago act same way , they changed out injector because of code , that wasnt it , from what i recall , it ended up being a lifter and bent pushrod , took alot of diagnostics , said it had 60 sum thousand , going down highway at 60 and started all sorts of racket ,the way it sounded there was a whole lot of hammering going on in there , he has had 2 fords since and just bought a new chevy 4 months ago ,
 
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