You guys have the right idea, but monitoring amps is even better. Just make sure everything is off, just like it would be with the car sitting at night with the doors closed, and ignition key out. ...
Install old IACV if it changes... friend did same thing and it was backfiring badly. Got old IACV bad and its was ok... but we didnt found out what was the "real" problem behind this...
The first thing I would do is put the old iacv and AAC back in just to rule that out. You stated that you didn't mess with the vacuum lines or piping but the iacv and AAC are part of the vacuum lin...
I tried wiring the simulated narrowband output from the Innovate unit to ECU pin 19. It seems to be more stable at 2000rpm, and make adjustments quicker and more accurately.
Here's a pic of my temporary install, so I'll get used to logging the values. Don't worry, I'll tap a dedicated port for it later on, and get rid of the clear tube :P
http://i.imgur.com/mU7DDzz.jp...