Desperate help needed

Ok. 2008 z71 flex fuel vin 3 suburban. So many different codes. Here's the issue.. it starts but won't stay running. Service 4wheel drive light comes on. Sometimes service stabiltrak comes and sometimes reduced engine power. Now I've replaced. 02 sensors bank 1 and 2 knock sensors I've replaced starter because I killed old one trying to start it so much. I've replaced tps sensor.. map sensor.. spark plugs. EVAP purge and the vent valve solenoid... All codes that it was throwing. The fuel pump is not even a year old. Not sure about fuel filter on these. I've checked all vacuum lines seems to be good. I have a code going off now for transfer case control module also like 4 different codes for misfires. Also even though I've replaced all the EVAP it still throws the code for it even after being deleted. Here's the situation recently had a house fire so in stuck at my elderly parents old folks very nice campground park. I can't get this to run or work and I need to get this thing running and working asap. I will provide all codes even though they seem to change.. maybe replace fuse box? I don't know but I can't get my parents kicked out for my truck just sitting there and can't be vehiclelsess I need some Quick suggestions on what it may be and what to do. I'm on limited funds. I've cleaned throttle body and replaced most all sensors. Po120 po122 po223 po443 uo102