[ob_1jr]

When's the last time you changed your fuel filter? How much you been idling up here in AK? We just a our truck at work (a ford) have some problems....thinking it was the cat getting clogged. Anyway, here are what your codes point to.

P0101-MAF sensor (this could be the crappy running part) try and clean it gently with electrical contact cleaner.
P0401-EGR flow insufficient
P0404-EGR open performance
P1229-Injector 3 output circuit
P1244-Injector 8 output circuit

I think there was a TSB for the injector harness chafing too...I can't find it right now. I would at least try to unplug the edge and see if it clears up. Did you take your truck to Aurora or the chevy dealer.....Aurora has never given me a problem. I bet that your MAF sensor is dirty causing other problems....You could also get an EGR blocker plate and a finger stick to fool the EGR. Let me know if I can help since I am up in the Fairbanks area.