Can gas really make that big of a difference?
 

Ok, I've been posting about my stalling issue for some time with no resolution. I've had a full tune-up, checked battery cables for corrosion, and even replaced my cat. After replacing my cat I did notice it had more power and didnt bog down anymore but its starting to happen again. The one thing I did notice is that when I use 89 gas over 87, the car will run longer before stalling. Out of all the suggestions I have gotten, would a new fuel pump possibly help. Also I have been suggested into looking into getting a new computer. I had a previous issue with my RAC module that caused my car to run bad and constantly drain my battery. Could either the fuel pump or computer be a potential solution?? My battery and temperature gauges also move back and forth the ENTIRE time im driving but thats the least of my worries.

before replaceing the fuel pump, i would suggest testing the fuel pressure to see if it is up to par, as putting in a fuel pump isnt that easy

Im not that big on self repairs, some things I can do and a lot I can't. How exactly would I check the fuel pressure. Also, I wouldnt be changing it myself.

pump
 

Without testing it you are just throwing parts a it hoping the proble will go away.
I would be more apt to change the filter, do a pressure test, and remove and clean all sensor connectors as well as the computer harness. Then a bottle of fuel injector cleaner.
Not sure which year but one of the early 90's cars has problems with the fuel pickup in the tank.
Maybe someone else will chime in.

changing the filters and cleaning the sensors and other things I can probably do myself. Which ones should I be going for? I tried the fuel system cleaner, it helped a little but I still have this irritating, random stalling.

Not 100% sure on the location of the the attachment point on the fuel rail(correctname slips my mind right now at 2:15AM), but you need to get ahold of a fuel pressure tester and hook it up. The attachment point on the fuel rail looks like a valve stem on a tire. Typically Autozone/Advance Auto Parts lets you 'borrow' tools like these if you don't have them.

Maybe somebody else will chime in with what specs you should be seeing, because I myself am not sure. I think I may have seen something in techinfo...

I lookws through tech info but I found nothing about how to test it. There were a few threads about it in the archives but nothing in specific about procedures.

fuel pressure
 

You just screw the end of the gage onto the schrader valve on the fuel rail and key the ignition until you hear the pump run and then stop. Then take your reading off of the gage.