Low fuel pressure 2008 yukon

I have typed the long rundown of this story 3 times
just to have it erased so I'll just get to the latest
problem. Put bad gas in at gas station. An hour
later it won't run. Put in New fuel pump. While
doing so found that the previous owner had it done
not to long ago but the return lines didn't have any
clamps. So new pump 12 gallons of high test and
fuel injection cleaner. Started up and ran great for
30 min. Then died. Now it will start and stay
running but very rough idling. After a minute the
dash pops up reduced engine power and codes
p0223 and p0122 come up. Please help. Can't keep
tossing money at it