Well, I have a 1984 Chevy Celebrity. It has a carburetor so I don't have any experience with the FI. I do have a whole list of links that I have used to maintain my Chevy. They are listed below. Most important, your computer is what they call OBDI (On Board Diagnostics #1) and can be read out with out any extra equipment. Some of the links describe how to just jumper the two terminals of the connector under the steering column and read the codes. Some of the lists of codes disagree with each other so you sort of have to use all the lists at the same time and decide which might be applicable to your car.
By far and away, the AutoZone site is the best. Put in your make, model, engine, etc. Go to the repair guides. Great descriptions of all the systems in the car. Full wiring diagrams. Check the "Drivability & Emissions" section. There is even a set of 35 flow charts to follow based on what error codes you read out of the computer. I found the AutoZone instructions for reading the computer to be a little confusing so I used some of the other sites to better understand the process. Then I returned to the AutoZone site to follow the error codes.
Some of the links have all kinds of cautions about starting and running with the jumper in place. That is bunk, the trouble shooting charts have you doing various combinations of that all the time. The computer is programmed to do certain things depending on whether you jumper before start or after.
I had stumbling, stalling problems, etc. I used the trouble charts to find three broken hoses, one crushed one, and stuff out of adjustment. It helped a lot but still a little hesitation. After a few weeks time, most of that has cleared up and the car runs pretty good.
Here are the links I used:
http://www1.autozone.com/servlet/UiB...ginRepairGuide
http://www.troublecodes.net/GM/
http://www.4chevy.com/troubleshooting.htm
http://www.mkiv.com/techarticles/eng...bd1_codes.html
http://www.seanster.com/scantool/gm_codes.html
http://www.seanster.com/scantool/ecm-codes.html
Hope this helps.
Pete.