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I saw what you replaced, didn't see any testing? What testing have you done? Make sure battery has a full charge?
When the problem is ongoing, have a helper crank it, while you check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. Any applicable trouble codes?
If you have the spider fuel system, that system is noted for problems.
You may be having an intermittent failure with the fuel pressure regulator - checking the fuel pressure when the truck won't start may pinpoint this problem. If the pressure looks OK, this same problem can be caused by the ignition system as well (ignition coil or control module).
Trail Blazer has a very cool 'plastic' intake on the Vortex series. I would have the intake checked out, or just replace it with a new one. Don't reccomend a used one since it was a common problem.
Sounds like it could be a mis-fire. At an idle, remove a plug wire to see if it stalls. If it does, re-install it and go to the next one. If you remove one and get no change, that cylinder is the problem. Test for spark.
sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know
crawl under the Blazer and hit the gas tank with a heavy rubber mallet with the key in the on posision now try to start the blazer if the blazer starts up replace your fuel pump trust me if you fuel pump is stuck this can free it for and emergancy and you can get it some were
might want to check the altinator i had the same problem last year repalce the battery and still had the problem after a few days turns out the altinator was not giving enough while in the drive postion butwould be ok in park
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