car starts then dies

[bmorezcmunee]

ok well here it goes

i have a 95 cavalier 2.2L. a few weeks ago i was driving back home from across town and my engine started sputtering. i heard backfire inside the engine so i pulled over and popped the hood. it sounded like my engine was struggling to stay on. so i putt putt all the way home. so ive been driving around like that for a while. long story short...i replaced the---

spark plugs
spark plug wires
ignition coils
all the gaskets

im starting to think its my fuel pump. im going to replace the o2 sensor tomorrow. i dont think the cat is clogged but its a possibility. anyone have any other suggestions?

and also when i start the car its runs fine sometimes, but it will cut off after a few seconds.