Sputtering

Yes, it could be the fuel pump. But let me address some other possibilities first. (1) Those cars are super picky about their spark plugs and wires. What spark plugs did you use? Did you change the wires too? (2) Have you run a spark test on it at the coils yet? Coils can pretty randomly go out on these cars.

First off, checking for sparks is pretty simple. Just get a spark tester and hook it up to one of the plug wires (where it connects to the coil). Here is the in-line spark tester that I have: https://www.amazon.com/Lisle-20610-Inline-Spark-Tester/dp/B0002STSC6/ref=sr_1_3?ie=UTF8&qid=1501325755&sr=8-3&keywords=spark+tester - it's also available at the local parts shops.

If you find one or two plugs that are bad, replace their individual coils. The images below contain instructions on replacing the coils.

Fuel pump information is below.

Fuel pressure can be tested by borrowing a gauge from the local parts store (AutoZone, Advance Auto, O'reillys). Herei s a general how-to guide that we've written up: https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I am also attaching AllData's information regarding fuel pressure and how to test it in the images below. Run this check and see what comes up. You should get 41-47psi with the key on and engine off.

And no, you cannot replace this pump without dropping the tank. For simplicity's sake, I will attach AllData's instructions for replacing the pump in the next post momentarily.

Okay, here are those instructions. Again, if I were a betting man, I would probably put money on it being spark related and not fuel related. I have dealt with more than a couple of bad coils on GM 3.1 and 3.8L engines.

Nice work! I am glad you could get it fixed. Please feel free to come back anytime.

Cam sensor would likely throw a trouble code. Is the service engine light on? If so, have you tried to retrieve the trouble codes? Here is how to get them: https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Ah, okay, definitely retrieve those codes. All you need is a piece of wire or a paper clip and you will be able to get them without any special equipment. Once you do that, post the code(s) here and we will go through them together and see what we can figure out.

You should be able to connect those top two and then turn the key and get the codes. Maybe try using a different jumper wire or a paperclip (my favorite tool for this job). If that does not work, then you will have to find a private mechanic that has been in business for a while. They will have the old school scanner for that car.

You might also try checking the battery cables and their connectors at all ends. Loose, dirty, or corroded connectors can cause all sorts of weirdness. Here is our guide on that: https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

You are one of the lucky few, that is the OBD port used on some 1993 to 1995 GM cars that use the SFI/TPI systems with a MAF sensor. It is a transitional system that GM used in those years and decided that the ALDL connector did not need to have the diagnostic access pin in the connector. The attached shows the possible pins and what they are used for. Test pin B is missing on yours. But the upside is that with the correct scan tool like an older Snap-On brick, the OTC Genisys and 2000 plus the Tech 2 with adapter can access that system and get OBD II type data feeds from it as it uses an OBD II system laid over the original OBD controls.

Well there. I learned something new and it is not even 7:00 am yet. I thought that was only on 1995's.

I should have thought of this earlier, but try putting a bottle of Heet in the gas tank. If you got bad gas, this will help dry out any water in the gas tank. Some gas stations and the auto parts shops carry it.

Iso Heet: https://www.walmart.com/ip/ISO-HEET-28202-Premium-Fuel-Line-Antifreeze-Water-Remover-Injector-Cleaner/16879747?wmlspartner=wlpa&selectedSellerId=1122&adid=22222222227009478515&wl0=&wl1=g&wl2=c&wl3=52923942311&wl4=pla-84844374791&wl5=9009593&wl6=&wl7=&wl8=&wl9=pla&wl10=101593696&wl11=online&wl12=16879747&wl13=&veh=sem

And here is the scanner that Steve and I are talking about: https://www.ebay.com/itm/2-SNAP-ON-scanner-MT2500-w-accessories-adaptors-carraiges-to-2004-mt-2500/282973272311?epid=1411827082&hash=item41e28578f7:g:-90AAOSw0l9a6Ps2

Please let us know what you find. We are interested to see what it is.

Cheers, Ken