(Chevy Suburban) Is it fuel or air? causing above normal fuel trims.... Part 2

2001 Chevy Suburban SL 5.3L
In this part 2 video I dig deeper into fuel delivery and air delivery and show you the cause and fix.

[@simonflores3410]

I drive a 2015 GMC Sierra 1500 5.3 eng. 4whl drive what is the spec on a Mas air flow sensor my stft are -3 an ltft are -14 on bank 1 bank 2 stft-2 an ltft -19 what else can I check please respond to my ? Thank you keep those video coming

[@EliTheOBDTech]

Your Maf sensor reading should be around 5.2 - 5.6 grams per second.

[@EliTheOBDTech]

If you raise your rpms, what happens to your fuel trims, do get better or worse?

[@simonflores3410]

@@EliTheOBDTech my stft 3 bank 1 stft 2 bank 2 ltft -19 bank 1 ltft -20 at 3000 rpm ltft numbers the not move just stay there at -19 an -20 stft went to +4 an +5 )my MAF sensor is on 5.4/5.6 grams per second please respond thank you for your videos