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The first thing I recommend checking is fuel pressure. It sounds like it is starving for fuel. Here are the directions listed for your vehicle. The directions include pressure specifications.
1. Release fuel system pressure.
2. Disconnect fuel inlet hose from injection unit and tee in a suitable pressure gauge.
3. Start engine and check for fuel leaks, then check pressure gauge reading. At idle, fuel pressure should be approximately 14 psi on 1986 Pickup and 1987-88 2WD Sentra or 36 psi on 1987-88 Pathfinder, Pickup, Van and 4WD Sentra.
4. Release fuel system pressure, then remove pressure gauge and reconnect fuel line.
Here is a link that shows how it is done in general but with more detail:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Let me know the results.
Joe
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Wednesday, March 13th, 2019 AT 9:29 PM