Dear Nathan2715,
Hope you're well and stay so! Intermittent spluttering on acceleration suggests fuel insufficiency. You've checked most of the mechanical elements of the fuel supply system, e.g., fuel filter, fuel pressure regulator, etc.
But what about the electrical elements, e.g., the fuel pump relay (most likely white, rectangular, on the main fuse block, behind the front center ashtray) and the fuel injection relay (aka the radio interference suppression relay, in the engine bay, very dark brown, rectangular, against the inner fender wall, close to the battery?
How many miles on this car? Have these relays ever been replaced? Is the single, in-tank fuel pump the factory-original item?
What about the ignition coil (square, mounted on the front of driver-side strut tower)? The contacts between the coil and its base may be invisibly corroded, so a cleaning with an aerosol corrosion-remover (e.g., Deoxit) may be wise.
If the fuel pump and fuel injection relays are factory original - and they should have dates on them - they might usefully be replaced. After nearly 30 years of service, they don't owe you even a penny.
Hope these suggestions help.
Yours faithfully,
Spook
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