Uploaded February 2026 | Updated September 2026, 3 weeks ago

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Struggling with idle issues on your Holley EFI system? In this video, we walk step-by-step through how to properly set the throttle body curb idle screw to achieve the correct Idle Air Control (IAC) position and Throttle Position Sensor (TPS) calibration.

Using Holley Sniper EFI, Terminator X, and HEFI, we explain how to set base throttle angle, why your engine should idle without the IAC, what causes the IAC to enter hold mode, and why performing a TPS Auto Set is critical for a stable idle. Learn the correct IAC percentage range, how throttle blade position affects idle control, and how to avoid common mistakes that cause unstable idle or drivability issues.

Perfect for anyone tuning a drive-by-cable throttle body or troubleshooting idle problems on a Holley EFI setup.

For more EFI tuning tips and tech support resources, visit Holley.com.

Learn More:

holley.com/products/fuel_systems/fuel_injection

holley.com/products/fuel_systems/fuel_injection/gauges_and_displays/lcd_displays

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