92 s10 blazer 4.3 starting issues

[Damien]

The IAC could be dirty or worn out. Take it off and inspect it. Look for carbon and wear.
The last time you asked I suggested it might be the coolant temp sender. This is a very common thing to fail on a TBI engine. It tells the computer what the engine temp is and if bad will make the truck run very rich and the throttle will need to be held wide open for the engine to start. If you have access to a scan tool, check the coolant temp with the engine cold and compare it to the ambient temp.

The IAC is more likely the problem on the CPI engines. You could also have bad or dirty grounds. How are the plugs, wires, cap, rotor?

Performance Distributors makes a HEI for the 4.3. A little pricy though.
http://www.performancedistributors.com/gmssdui.htm
I found a large cap computer controlled HEI for a 4.3 then changed the pickup and module to the old style 4 pin non computer controlled. I think you could do it with a v8 dist. too, but the star wheel and pickup would have to be changed to the V6 parts.