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Hi, I just finished installing my ZE. It runs fine and I have no CEL. The only problem I have is that it the idle speed is too high. I played with the AAS screw on the TB but the lowest idle speed I can get is 3000 RPM. If I unplug the IAC valve connector the idle speed drop to 2000 RPM. The idle speed is stable. Here is some info about my setup:<p>- Curved neck KLZE
- Curved neck IM
- ZE TB
- ZE injectors
- K8 ECU
- Swapped the K8 EGR system on the ZE

Have you tried closing the throttle plate some by unscrewing the allen screw at the bottom? Then use the AAS for final adjustment. Try that first, if still no luck, most likely a vaccum leak.