I have a Sniper EFI 102 throttle body with the 543-105 IAC, and a Painless Performance ECU (MEFI 4B) & wiring harness. My IAC & throttle body are brand new, but the IAC doesn't seem to be working. I can't hold a low idle around 750 RPM, engine tries to die and then cranks up to around 1500 RPM, IAC counts steadily drop to zero. If I unplug the IAC, engine does the exact same thing.

Anyway to troubleshoot the IAC or anyone know if it's wired differently from a factory IAC? I can apply power to the leads to troubleshoot, but not sure what leads to apply to, and don't want to apply to the wrong leads and jack anything up. Thanks.