Fuel Pump Issue?

Hello,
This is for a 1990 Prizm (Automatic, EFI). A few days back, started car, went for a couple of miles (first on city streets and then a mile on the highway). Stopped in traffic and could feel the power cutting
off. However, traffic cleared that very second and I hit the accelerator and that was it. Drove for about 35 miles without any problem (25 on highway and 10 on city streets).
Next day, started car in the morning, went for a couple of miles (city street). Stopped at light and car just stalled. Tried to start but it wouldn't start. Let it cool for 45 minutes and then no problem. It started without any problem and runs great. It's been 3 days no problem. But yesterday the same thing happened when I stopped at a light.
What could possibly be wrong - my first inclination was fuel pump or ignition. However, if one of these parts is bad (or going bad) will they not exhibit symptoms all the time instead of intermittent problems that is in my case?
Thanks a bunch for your help
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Have your catalytic converter(s) checked. There may be some exhaust system blockage...and it would appear to be getting worse...
B.
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