Idle and stalling problem can't figure out

I have a 92 Chevy S10 Blazer. A few weeks ago it started stalling in idle, and has gotten worse. Now it stalls in idle and then when I try to turn it back on it will crank but won't start. When I turn the key to the on position, I can hear the fuel pump turn on. There is no check engine light and not giving any trouble codes besides 12 (everything is fine). Here is what I have done:

- replaced the MAP sensor
- replaced the throttle position sensor
- replaced the PCV valve
- replaced the fuel filter
- inspected all vacuum hoses, which are fine

I'm at a loss of what it could be. The next thing I was going to try is replacing the idle air control valve, but am not sure that will help.

Any help or advice would be greatly appreciated.

Thank you!

I'd check the fuel pressure to see if your getting enough. I'd also check for spark when it stalls and won't start again. Do you have a distributor, wires? How are they?

Thank you so much for the response. I have not yet checked the fuel pressure, will try that tonight.

Finally able to check the fuel pressure. 52 with engine on and off, no change. It didn't bleed off when it eventually died and when I turned the key to the off position.good regulator, bad fuel pump?

when it stalls squirt some sensor safe throttle body cleaner in, see if it will start, if it starts it is something with your fueling. does that have TBI ?

Thank you so much for the help.

It was the fuel pressure regulator. I was able to change it out and it is back to running as normal.

Dude its good that you are owner of the 92 Chevy S10 because in these days i think its impossible that to purchased the chev if its not start then must battery is out of order because current is not circulate in the wire..