Hey guys I'm looking for someone that can help me diagnose whats going on with my car. I recently installed a Blox Racing Throttle Body and Block Racing Thermal Intake Manifold Gasket. Before I did this install everything was working perfectly on the car but after I did the install I have been having this one issue with the idle, when I'm coming out of gear and coming to a stop the idle doesnt drop right away and it takes a second for it to drop to a regular idle.

I did adjust the TPS Sensor to the OEM Spec and still have had no change.
The throttle body I'm using is the Blox Racing Tuner Series 68mm P/N BXIM-00210.
I also port matched the throttle body housing on the intake manifold as well.
IDK if its the throttle body causing this issue or if it may be the thermal intake gasket.
Its on a 03 S2000

Thanks in advance for any help you can give me!!!