Why would check engine light code say o2sensor replaced it still stalling out

I thought it was kinda fatherly since it's almost Father's Day!.. Hell, it could be any number of things.. What engine size.. Fuel filter/pump been replaced?.. Got spark when it stalls out? .. We can only guess at it and that don't help...Got yo do some hands-on-on testing!

Fuel pump fuel filter aicu and cranks back up on its own at times but at times got to put gas or stating fluid in throttlbody to crank back catalittic cconverter good

If you got to put gas in T-Body to get it to start... The fuel pump ain't doing its job!!.. When it won't start, listen for fuel pump running.. Possible relay problem... Fuel pressure needs to be checked but hooking up a gauge is a bitch on this one....whether it's a 4 or 6 cylinder.

Good Gracious of Life!!feel like i've been cut.did they get that 4.3L blazer running?fuel pump?