I have a 91 blazer with the 4.3 that suddenly just stopped running and cut out after running awesome. It has compression, fuel, spark, recent tune up, all fuses under the dash are good. Sprayed starter fluid directly into the throttle body and drill didn't fire. It cranks but wont start.
Thinking either the computer, need to check the fusible links and was also told I could have bad plugs. Any ideas?

 

could check fuel pressure
could pull a plug to check it too

also make sure you have a good blue spark to the plug

Good Luck

 

Mine did the same thing ended up being my distributor I'd say try that if u haven't already figured it out

 

It was. Had to have all of it replaced after fixing everything!!! Running like a beast now