Engine stalls when at idle?

I visually inspected the EGR valve and didn't notice any faults. I need to check it with a vacuum tester I suppose. Not sure where the injector relay is located.

I do not have a relay box under the hood. There are 2 relays located on the firewall and a relay box that houses the fuel pump relay in the cabin below the center console. My manual doesn't show a injector relay. Any suggestions?

Thank you for the schematic. It is hard to view and it appears to be different than my vehicle wires. I noticed the schematic is for a VIN W. I have the TBI VIN Z.

Ok guys. The abouve diagram was too blurry once printed, but thank you anyway. I spent the majority of Sunday messing with this thing with no success. Here it is Monday morning, and it starts right up and stays running. What the heck is going on? Brought it to work so no walking today. I'll see what happens around 5 when I go home. I might do some more checks at lunch time. Any more suggestions please? The IAC was removed and appears to be clean and not stcking. The PCM was removed and no visual problems noticed. There is a red pig tail under the hood to apply battery voltage to, to power up the fuel pump. I hear the pump running with battery voltage being applied to the pig tail. Is it safe to try that while the engine is running and apply the voltage just about when you can tell it's going to stall?

The fuel pressure was about 13psi.

EGR valve looked good and with vacuum applied the diaphram moves and holds steady so I assume it is good. I guess I can try a IAC valve but I don't like the idea of throwing parts on it like the ignition module which didn't fix it but I guess I don't have a choice at this point. Thanks for the info. I'll keep you posted. At lunch it started right up with no faults again. I bet it won't run when it's time to go home though.

I understand. I thank you guys for the help and advice. Just gets very frustrating as you probably understand. Would an IAC valve cause these issues only at start up? Trying to understand what exactly is happening during start up and idle that would cause this mystery to occur. Never stalls when driving it. Reliable while it's actually running, just getting it to that point is difficult sometimes. Really weird how it acts up sometimes for a few starts, then somehow fixes itself, then will drive fine for 3 - 5 days with no problems then all of a sudden the next morning it won't start again. Freaky?

Engine Performance problem
1994 Chevy S-10 6 cyl Four Wheel Drive Automatic

When I try to start my 1994 s-10 Blazer, 4.3 auto, it will only start when the gas pedal is held down a little bit, and when you release the gas pedal, it will not idle and dies. It will drive fine until you have to let up on the gas pedal and then it will die. I actually swapped out everything that had a wire running to the intake area with another running s-10 that I own and nothing seem to change the starting issue. All vacuum lines are hooked up. However when I pulled the off the map sensor and left it out by accident, it started right up and ran fine, Now what?

I have already swapped out the map sensor off of another good running s10 that I own and it did'nt fix it.

Well, it wouldn't start yesterday after work. Does the same thing as before. Actually it does start but stalls about 5 - 10 seconds later. This is a TBI Z VIN engine. I think the pressure is suppose to be around 13psi.