2014 Silverado 5.3 p0300 code

[Zackb12]

Hello. I have had a p0300 trouble code for a little bit now. Been replacing parts and still not finding an end to the issue along with this code is a p0175. The truck is reading random misfires on 2,4,6,8. And the odd one on 5.

I replaced,

spark plugs

plug wires 

MAF

o2 censors on bank 2

along with cleaning the ground connections. 

 

The truck ran good and no codes after replacing plugs and wires but then next day it had misfires again. Engine light disappears when idling mostly, then also never has the engine light when I start it up after sitting.  Running out of options and last thing I can think of is the CAT. I see that this code is very different in each case. But any info helps. 
 

thanks 

[rav3]

I just watched a YouTube video on a similar situation. May not be your issue but sure is on the list that you haven't checked

https://youtu.be/SPneWXbqgAg?si=daLhRCTkST-PZN93