haha, I’ve never heard of a coolant bubble causing idle problems before. Sounds like a faulty TPS. You should check the sensor itself or at least pull some codes from the ECU before putting new parts on.
sent you a PM
On my sr20, a coolant bubble will cause a fluctuating idle. Coolant doesnt reach the IACV and it throws the sensor off. It is like this on alot of other motors as well. I am not sure if the KA24 has a coolant IACV.
does the ka24de need an iacv or can the aac compensate for it? i have done away with egr and bpt and am about to do away with the iacv 2.