I have a 2003 Civic Si with a K24a2 swap with the RBB manifold that came with the EP3. My issue is that the car is "hunting" at idle. when I let off the gas, it will pause around 1500 rpm for about 5-10 second then drop down to the designated 900 rpm.

I have tried the following solutions:

- Cleaning the IACV and ensuring that it spins
- Removing the IACV and installing a Karcepts Block off plate (w/ kpro of course)
- Burping the coolant system (successfully)
- Checked for vacuum leaks (couldn't find any)
- Installed a new O2 sensor (not the issue but thought I should mention it)


One thing I should note is that a code came on for the ELD but I disabled it in Kpro long before this issue arose (about 8-9 months before). Also, the car is burning oil but I am assuming that is due to valve seals and/or piston rings because the head gasket was replaced last year. I have not performed a leak down test yet but will do so before I pull the motor to install the new valve seals and other seals/gaskets.

I have been looking this issue up for quite some time now and still cannot find a solution. I am beyond frustrated to the point of selling the car. Please let me know if you have any ideas or suggestions. Thanks in advance!