After getting bad gas engine spits and sputters

Hi and thanks for using 2CarPros.

First, I would recommend checking the vehicle for trouble codes. They can point you in the correct direction very easily. Because of the model year, the vehicle has an OBD1 system. Therefore, you don't need a scanner to get codes. Follow this link. It shows how to retrieve the codes and what each one means.

Do this and let me know what codes you find. If you have lost that much power, I question if there is a plugged catalytic converter or low fuel pressure. That should show up with the codes.

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

Take care,
Joe

That sounds like it is getting too much fuel. It could be related to fuel pressure, a leaking injector, and other things. Since you mentioned the half choke concept, it would be a good idea to check fuel pressure. It may be too high due to a faulty regulator or the regulator itself could be drawing fuel through the vacuum causing it to run too rich.

Here is a link that shows in general how to check both the pump pressure and the regulator:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the specs for the pump:

FUEL PRESSURE
1. Ignition "OFF" for 10 Seconds.
2. With ignition "ON," engine "OFF" and fuel pump running, pressure should be 240-280 kPa (34-41 psi).

Let me know if this helps or what you find.

Take care,
Joe