When I pressed hard on the gas pedal the car stalled

Hello, I'm Danny.

The first thing you might want to check is the fuel pressure.You might have a weak or failing fuel pump that isn't supplying enough pressure when under load or acceleration.If you don't have access to a tester most auto parts stores have a tool loaner program and can rent you one.Here is a tutorial showing how to test:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

The proper specification for your vehicle is: 9-13 PSI with the ignition on. After performing this test get back to us with the results and we'll go from there.Hope this helps and thanks for using 2CarPros.

Hello again.

Oh, okay. So you're not getting spark is the problem? By any chance is the check engine light on or any codes stored? Let me know and we'll go from there. Here is a tutorial on how to check obd1 codes:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Hope this helps and thanks again for using 2CarPros.

Danny-

Hello again.

I've attached a bunch of diagnostic flow charts and instructions on how to test for a crank-no start condition. I've also attached the same for distributor ignition system testing which might help more due to no spark condition. They are attached below. Let me know what you find and keep me updated. Hope this helps and let me know if you have any further questions on this issue. Thanks again for using 2CarPros.

Danny-

Hello again.

There are 2 different 4.3 engines available in your Blazer and only 1 of the 2 have a crankshaft position sensor.I would need the 8th digit of your VIN - vehicle identification number to confirm. It will be a W or Z. Let me know and I'll find out for you. Have you tried the diagnostic steps? Hope this helps and thanks again for using 2CarPros.

Danny-