two tests to do off the top of my head... pick up a fuel pressure gauge... I believe it has to go inline at the filter on that year and check pressure.... also check to see that pressure remains under acceleration or if it fluctuates to correspond with engine surging.
the other test is to use a timing light with a degree knob to view the spray pattern of the injectors.... you would be looking for a nice cone pattern vs a weak 'spurt'
my first thoughts on the final solution are fuel pump, injectors, and/or fuel pressure regulator.
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