Fuel injector problem?

Check the fuel pressure it sounds like a pressure problem maybe the fuel pressure regulator. It sounds like it's dumping too much fuel.

I have seen a defective fuel injector cause this issue. FYI. also you should run the codes to see if any are stored, this guide can help.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Please go over this guide and get back to us.

I ran the codes got 22 TPS signal voltage low. 23 intake temperature sensor out of range low. 45 oxygen sensor rich exhaust.

I have changed the TPS and intake air temperature sensor recently.

If you still have these codes with changing the sensors you may have a bad ECM. I would double check the grounds for the engine computer harness.

Don't know how to do that.

Not sure about this car but on some of the 80s cars these codes can be cast when the pump fails especially if yours is the type where the ECU doesn’t control the pump like newer cars its usually turned on by a relay and simply regulated mechanically by the regulator usually by means of vacuum and sometimes electricity. Anyway, since you replaced those parts already, I’d say check the fuel pressure sounds like a pressure problem. Possibly the pump is bad or fuel pump relay or fuel pressure regulator .most likely the pump at this point in the process. if the car still runs at idle but stumble as soon as you give it gas. Yeah, I’d say check it to make sure it's operating normally and if it’s not there then check the ECU. Good luck.

Where is the fuel pump relay located?

And how do I check the ECU?

The relay box should be under the hood i think it's on the passenger side it's a black plastic box look in there. It should have a chart on the inside of the cover to tell you which is the pump relay. Also you can simply turn the key off and on without starting the car and see if you can hear the pump running for a few seconds it's hard to hear sometimes though especially if it's in the tank got to be quiet to hear it .if you don't hear it then you might need a relay but lucky these things are pretty easy to check doesn't take too long.