Hi and thanks for using 2CarPros.
Based on your description, it sounds like the fuel pump is weak and not an electrical issue. Do me a favor. Check it for diagnostic trouble codes. That way we will know if it is an electrical issue or not.
Here is a link that shows how to retrieve codes on an OBD1 system like this:
https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method
Also, since you had things apart prior to the problem, recheck you work. Make sure nothing was left disconnected such as vacuum hoses, sensors.
Let me know if you find a code. Also, consider checking fuel pressure and for vacuum leaks. Here are a couple links that you may find helpful:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Joe
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Tuesday, March 5th, 2019 AT 8:39 PM