AEM FIC help

[shawnitz]

Hi Yaris world I'm new here and need some help.

Short version of the issue:

Terrible hesitation and stumbling when flooring it. When going from closed loop to open loop with AEM FIC plugged in.

Issue is not there with the the stock ECU (AEM FIC bypassed). Vehicle completely drivable with stock ecu besides the leaner than desirable a/f ratio - so no stuttering when attempting to accelerate.

Long version of the issue:

When attempting to accelerate (change in throttle at any rate ending at the bottom of the pedal travel), there is a terrible stuttering which causes the vehicle to nose dive then back up and then back down for 4-5 seconds until 5k rpm. It is completely undriveable.

I have a 2008 yaris, boosted with zage kit, 250cc green corolla injectors. AEM FIC with Boomslang harness.

Things Ive tried:
1. Every version of the AEM firmware
2. Many hours of acceleration enrichment setting - sensitivity 2% to 50% (max) and all other settings swept
3. Unplugged O2
4. Unplugged coolant temp sensor
5. Response time from 300us to 900us (in 50us steps)
6. Calling AEM tech support which suggested to try different firmware
7. Unplugging (bypassing) AEM FIC which is the only fix for the stuttering during transient from open loop to closed loop.

Asking you guys is the last thing I will be doing before dialing the boost to minimum and completely giving up on this car.