91 Integra, 155k

Mods:8lb Lightened Flywheel, AEM FPR, BLOX IM, MSD Wires/Cap/External Coil, JG Bored 62mm TB

Problem: Car occasionally stalls when disengaging the clutch (coming to a stop) OR the idle goes very low, 400-500rpm. Sometimes when I put in the clutch the idle goes straight down to zero, just dives all the way. Other times it dives, bounces, then stalls. The car restarts fine after stalls, has no other problems, no power loss, no stuttering, nothing. Accelerates fine. Some days it does this, other days not at all. I have determined no patterns.

I had the Clutchmaster flywheel installed for a year before this problem started happening so its not the flywheel being too light for the ECU to compensate.

Otherwise, idle is 800rpm but car runs a tiny bit rough, runs very smooth at 900-1000rpm.

No codes are being generated by the ECU. Grounds are solid, battery terminals new. No vacuum leaks detected. Recently cleaned IACV. Injectors, cap, rotor, plugs are all new. Set fuel pressure to stock PSI range.

Because the car accelerates fine and drives fine I do not believe this is a spark or fuel delivery problem. The only problem I have is the stalling or low idle when I put the clutch in and its not all the time.

I'm going to replace the Bosch O2 sensor, MAP sensor, and Crank Angle Sensor.
I'm also going to recheck the plugs, spark plug wire resistence, cap, and rotor.
Any ideas appreciated