blinking check engine light

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hey guys i need some help im going crazy chasing this problem in my truck.its a 01 suburban 1500 has the 5.3 4x4 lt model.ive been getting this check engine llight blinking for a long time very erratic at all diiferent times.it comes on blinking and the truck will start running like crap.at first i swapped the airflow meter.didnt work.it feels like it starts starving for fuel but if you smell the exhaust it smells rich.the codes i used to get would point at the 2 sensors on top of the fuel pumps so i changed out the pump with a brand new module.didnt work then i changed all 4 02 sensors no luck there so i finally had the cats punched out since they say thats why the light would blink meaning your gonna danage the cats.still no luck but its was much more drivable when blinking after the cats got punched.so these codes are what im getting after all of the above work let me know where you guys think i should go next. and very sorry for such a long post but i wanna get this fixed.thanks VJ

---------- Post added at 10:07 PM ---------- Previous post was at 10:05 PM ----------

sorry forgot the codes po 154,po 171,po 174,po 300 and po 453 and po 141