Based on age, I'd suspect the fuel pump, if original. Art Benstein replaced one on a relative's '92 a couple of years ago. It's tricky to get a gauge in the fuel rail schraeder valve, but Art managed with a tire gauge -- enough to see low pressure. Should be about 36 at idle, going to 45 with the FPR vac hose removed and plugged.
You could also check the pump current draw at the 4-pin plug (pink wire) in the left rear "wheel housing" after removing the panel cover. Should be at least 7 or 8 amps. I recall Art saying he saw a low and fluctuating current on the pump he replaced.
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