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I found my problem with my 1996 GMC Jimmy, After troubleshooting and exhausting all other possibilities my search finally came down to a bad fuel pressure regulator. It allowed the engine to run (albeit badly) and fine at normal RPM but it would randomly stall. This was because excess fuel was being dumped into the back two cylinders and causing all kinds of havoc. Won't throw a code unless you get a lucky "misfire" code thanks to the excess fuel causing the engine to fight itself. So if your Jimmy or Blazer is starting then stalling several times while still somehow running fine once it got going, check your regulator. it's easy to tell if it's bad thanks to it's overflow valve washing out the back two cylinder intakes. Good luck and hope it helps.
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