1993 Z32 TT(automatic) 69K on it. Cold start stalls. Car will start and stall unless I keep my foot on gas for around 40-50 second. Car runs and drives 100% when the car is warm up I can shut off the car and will start back up with out any issues. Only stalls at cold start. I replaced the Idle Air Control Valve (IAA / IACV) new from Nissan dealer still same problem. I try to addjust the IACV/ the screw no change to RMP( try that with the Old IACV also no result).

First warm car up to operating temperature

Next turn engine off and remove key
Disconnect the AAC connector from the IACV (Idle Air Control Valve) (yellow)

Start the engine and use the IACV adjustment screw to lower idle to 650rpm ( try that no change to the RPM)

Final step is to plug the AAC connector back in and your idle should rise and then settle to 750-800 rpm (no change RPM/ RPM stay at 900 on operating temperature)

Main problem is my car still stalling when cold start
Anyone have any idea what's going on.
Thanks

Spark plug issue (wrong rating or type), coolant temp sensor (sensor itself or connector or both)? TPS?

I did put new spark plug but I got it from Zmotorspot for 300zx TT NKG type6 which is 1 step colder than regular plugs. I will look in to coolant temp sensor

Neither a spark plug nor a temp sensor will cause the car to die in my experience, I just fixed a similar issue on mine, TT as well, I would look into bypassing your FPCU (fuel pressure control unit) which controls the voltage going to your fuel pump, I believe concept Z has a write up on it, pretty simple to do should take you no more than 30 minutes, but basically your fuel pump will be running on 12v all the time