I have a jza80 with 2jzgte, running a plugin G4+. I have just got it back from being tuned. Every time I decelerate using engine braking, when I disengage the clutch, it stalls. If I disengage the clutch directly after accelleration the idle control valve brings it back to idle nicely. It's like the ecu is seeing idle pos on the tps during overrun, and it's trying to achieve 900 rpm, but it can't achieve this while decelerating so the icv ends up being shut altogether, resulting in a stall once I depress the clutch. Im not an experienced tuner, but I would like to know how to solve this problem myself. Any help is much appreciated Ryan