1992 s10 Blazer fuel issue?

When you work a lot near a 'vehicle from hell', being stressed, sometimes you forget a small thing. It happened to all of us, at least once :) You should try checking what is the error when the light is on. This is an obd1 I think so not all testers work with it if I remember correct.

Maybe a bad electrical connection to the fuel pump.

Did you happen to check the fuel pressure? And what was it. One possibility is the fuel regulator may need to be rebuilt. Another thing is the coil could be weak, that could be tested. You said a new distributor, did the include the ICM? And you don't need a scanner to get the code stored in the OBD1......Turn on the car (DO NOT START IT*) and use a paper clip or a piece of wire to jump terminal A & B. DO NOT TRY TO START THE CAR*! You will see the SES (Service Engine Soon) light flash out a code. It will flash out each code three times. The first code you will get will be a code 12*. It will be a single flash, followed by a short pause, then two flashes. It will then pause for about two seconds or so, and flash the code again until it was read out three times. The code(s) after this will be your trouble code(s). Make sure to have a pen & paper handy to write them down. When you get back to code 12 it is finished...IMPORTANT!...Once you are done writing down all your trouble codes, turn off the ignition and remove the jumper between terminals A & B. To reset the codes, simply pull the ECM fuse (Blue 15A) for one minute. Doing this will reset the ECM back to factory settings, and the driving parameters will have to be relearned (the car will do this itself). *Starting the car with terminals A&B jumped or jumping the terminals with the car running, will force the ECM into limp home mode. This can damage the ECM and/or the drivetrain if the car is ran/driven like this.