Help Needed 2002 Denali Wont Stay Running

[Eviltwincustoms]

Ok hopefully someone can assist me here with my issue. My 2002 Denali will turn over and fire and run and if I push on the gas, it acts like it is flooding out and will idle rough and die.

I just changed the fuel filter and Fuel Pump 2 months ago. I have checked the fuel Rails and fuel is making it to the engine. I had the alternator checked and it was not making enough volts so I thought it wasn't getting enough power to the electronics. So I changed the Alternator and that didn't help either.
The issue that I am running up against is that the Check Engine Light is not on and I have been told that the hand computers will not identify the issue without the "Check Engine" light being on.

I was able to hook the puter up to it and it reads the following:
MIL OFF
Monitrs
5 Inc
Catlyst
Evap
O2 Snsr
O2 Htr
EGR
3 Ready
Misfire
Fuel
Comp

Any assistance I can get would be greatly appreciated.
Thanks,

[bcopeland]

Does it die out in park on the gas pedal or in gear under load?

[Eviltwincustoms]

It will die out in Park. If I can get it above 1500 RPM's and ease on the gas it seems to be fine.

As well I did finally pull two codes P0174 and P0174 which says Bank 1 and 2 are running lean.

I hate to spend$300-400 on sensors if this isn't the issue. Man this is getting to be costly.

[maxwedge]

Check the fuel pressure first, look for 58-60 psi.