Rough idle in park and intermediate flashing engine light

[Yukonsuburbanali]

I have an 08 Yukon 5.3, no cats, straight pipes. I was getting evap leak codes as well as knock sensor and my dash tells me to tighten my gas cap sometimes, but the other day I was at a stoplight and my CEL started flashing and my truck said service traction cntrl/stabilitrak. My truck has been idling like it has a vacuum leak, just very choppy. I hooked up a scan tool and it showed misfires on multiple cylinders. P0300, as well as P1175, P0174, P0325 and P0327 and P0328. I just got a new engine put it last year. I'm thinking its just a vacuum leak causing all these other problems but please lmk if anyone else has experienced this or knows what to do

 

[mikez71]

P0174 - I would check for intake leaks on bank 2..

 

[Fless]

Also look for leaky exhaust. Are all the O2 sensors still in place or have they been physically deleted, and deleted from a tune?