I really doubt it has a computer in it. It is an old car. I just have to ask why you are boosting the power in a Blazer. There are lots of things you can do, but the most significant change would be to drop in a larger V8. You won't find a chip for this vehicle. See if you can find Cold Air Intake, get new spark plugs, wires. Put on a new exhaust system. I don't think it is worth the effort with this car, unless you need the power to use it as a workhorse.