89 S10 4.3 Need help troubleshooting TBI/IAC Idle issue

[76C10Stepside]

Originally Posted by ChevyTech

Bleed Passage:
Some TBI units have a hole (Bleed passage) to release the fuel pressure when the pump stops and some TBI units hold the pressure after the engine is shut off. I have tried to find the criteria for which units have the bleed hole and which don’t but have never been able to find GM information on this.

I will see if I have photos of this, but not today. I have more projects then time.

Thanks!