AFM/DOD Q&A

Hey guys, stumbled across the lifter videos, I'm really interested in the tool and process of releasing the stuck lifter. I have a 2014 Tahoe 5.3 LMG and have random misfires at idle and light load, done everything easy to try to fix, sensors, wires, plugs, AFM tune. Question is how do I identify which lifter is stuck without a scan tool? Thanks for any help!