89 s10 blazer no spark

I don't think 3 months makes stale gas, maybe year old gas, but not your short time. And if not mistaken, I think you have throttle body injection on an '89 chevy, although chevy always was a little behind the curve on new improvements to cars. hint, hint.
The computer has everything to do with it. it controls ignition timing, it controls spark, it controls the fuel pump and the injectors. Since it won't start with starter fluid or gas, next step is to look into the ignition system. Check for spark on a couple of spark plug wires. If you have a blue, snapping spark, you can assume your ignition system is working well enough to start the engine. Take a spare spark plug or pull one of your plugs from engine, attach the plug wire onto it, and lay the plug on a metal piece of the top of engine-the spark plug hex and threads is the natural ground for the plug, so if you lay the threads on a metal piece, or hold it tight against a steel bolt, you can observe the spark jumping the gap, and no danger of getting shocked. But if you hold it, just in case, wear a glove or wrap a heavy cloth or rag around the wire. Remember, a blue energetic spark has to be seen to verify good ignition. Oh yes, you need a helper to crank the engine over while you watch for spark. If no spark, and you have a distributor, check the coil wires output at the end that connects to center top of distributor.Pull it from distributor and hold the metal end terminal no more than 1/4 inch from a ground source, a bolt or the frame, or an engine bracket. Helper has to crank the engine over, and watch for good blue spark. If no spark there-ignition: coil, crank position sensor (or maybe a pickup coil inside your distributor-same function), ignition control module, computer, and all the associated wiring.
If coil has spark, but none at plug wire ends, inspect closely the distributor cap and rotor. not passing current or shorting out there.
So the basics are, to run, the engine needs gas, air, compression, and a timely spark.

in the distributor is a ignition control module

It could be alot of things but I would try one thing at a time starting with the coil wire, then the cap and rotor. It could be the coil itself. If you havent worked on it before it happened then it is probably the ignition module inside the cap. It has a spark control and a knock sensor among other things that have alot to do with the spark. Theres a pick-up coil in the distributer that sometimes shorts out. But vary rarely. If you have a multi meter and some time there are tests to check out everything. You need to go in a line backwards so that you can run the problem down. Pull a plug and plug it in to the wire and set the bottom of the plug on something metal on the engine, spin the engine over and look for it to spark against the metal. Just be super careful because a spark needs a drop of gas , to BOOM you get to learn how to stop a fire. That kinda tells you if the plug is good. Then pull the plug off and stick a nail in the wire and ground the nail and spin it and see if you get a spark if not then move up to the coil wire. And so on and so on until you find a spark. If you have a test light check to see if you get power to the distributer , if you do and it wont spark then its most likely the ignition modual.

I take it that it cranks over but will not start. Spray some starter fluid into the throttle body. If it runs, you have a fuel problem. You may have disconnected the fuel system by unplugging a connector or grounding a wire blowing a fuse.

If your car have an alarm system, check for a hidden shut off switch, it must be re-set to start the engine again.
sammyc47

1.voltage regulator
2.coil

Have you checked the HT leads? The main lead from the coil - take off a spark plug lead and plug that into the coil insted and see if you can get it to spark to the engine, if it will spark with this lead then the main lead is bust. also...There is a condenser on the ignition, it prevents the spark from going anywhere but the plugs, if this has failed you will have a weak intermittent spark - heres what it should look like (attached to the distributor or very close to it) - http://www.rockauto.com/catalog/raframecatalog.php?catalog=233&partnum=84UX&a=UK233-84UX - click the "i" button to get a bigger pic - make sure yours is properly connected before you get a new one. It's incredibly cheap so may as well replace it + its 21 years old and counting and probably the only original part of the ignition.

change the pickup coil in the dist. or change the whole dist

When everthing is tested or replaced then the only option is a bad computer. or maybe you have clogged injectors or fuel system in the rail

change coil pickup which is in the bottom of the distrubuter