Will the stock fuel pump hold my setup and a 150 shot of wet nos or do i need to upgrade my pump. I will also run a couple of 200 shot runs. any help would be apreciated.

might as well go ahead and upgrade the pump. they are cheap enough just for insurance

Yeah you need a new pump 175 is about the limit on a 5.3 so with your setup and that big of a shot you need the pump.

which would be better an inline fuel pump or just install abigger pump in the tank?

get an intake fuel pump. pm blownchevy he can help you with one

could this also be why when i get around 1/8 tank my truck starts to cut out bad at wot

They dont make an in-tank one for our body style 03 and up you can get the walbro in-tank setup. You have to get an inline one. Speed Inc has a 255lph kit. Should do the trick. I dont have that problem that you are tlaking about even when I was spraying a 100 shot out of the hole with the low fuel light on.