97 4.3 Wont start, too much gas? Help

Ok here goes it started out loosing power like a plugged fuel filter,I changed it... nothing.. still power loss.
Now it wont start without starting fluid. I was just giong to change the Fuel pump again ya know?(seems like it might not be pump Though)
but it has a throttle problem I cant give it hardly any throttle or it completely cuts off ( no popping) just like it is getting too much gas and not enough air.
1) would all bad 02 sensors cause this? I didnt think so Thats why I have been running around with 3 bad ones, i think thares 3.
My jimmy has 241,000 miles on it and I dont feel like spending $150 on 02 sensors and have it run the same. I just want to see how many miles I can get out of the 4.3 before it blows up, cause it still runs very good.

2)Could it be the coolant temp sensor? or stuck EGR valve?

Of course I sent someone to buy a pressure tester and it is not the right one so I have to buy another one before I test the fuel pressure, sorry.
Would it run with boaderline gas pressure just not start? no?
The only codes I get are for the 02 sensors

Please Help me out I may have left out something, thanks a bunch

There was a post the other day where a fella had a EGR valve stuck open and truck would "flood". Try unhooking the EGR to see...

Maybe a plugged converter ..You may want to check that too....

I am checking the EGR and fuel pressure today
thank You very much.
Any other ideas?
it does rev up if i hold the trottle open just a little seems like its not the CAT

I AM changing the fuel pump!

Thanks, it was the fuel pump
jap fuel pumps keep working just not good enough
I have been having good luck getting parts warrantied at AZone lately