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Thumbnail Filmstrip of Adapter Harness FAST to Holley - IAC Early GMC Images
The IAC (Idle Air Control) valve uses a small electric motor to vary engine idle rpm to exactly where you set it at in your ECU parameters.
Part Number 308023:
- Wiring Pigtail allows use of Early GM TPI Style IAC in vehicle that has a wiring harness for Late GM IAC style connectors