S14 Ka24DE Cold start- Rough Idle

[nurevem1]

I have a 1997 s14 with a turboed Ka24de. When the car sits overnight or for a few hours in the cold weather (below 55 degrees) i go to start it up... starts up fine and rpms are at about 1,200rpm and after about 20 seconds-30 seconds the idle will drop. When the idle drops the car will throw the rpms from 800-1100rpm. My wideband is reading extremely lean (reading over 17). Once the car starts to get slightly warm (movement shown on coolant temp gauge) the idle smoothes out (for ex. after driving a mile down the road or reving the engine for a few minutes at about 2000rpm). If the weather is nice out (above 60 or 70) the idle problem does not exist. I have replaced the idle air control valve, dizzy cap and rotor, and plugs. I have monitored the colant temp sensor with consult 2 and the reading was showing about what the air temp was. I have cleaned the z32 MAF with MAF cleaner and have checked all piping and connections to and from the throttle body. i have tried adjusting the set screw on the IACV while the problem is happening and that did not help the issue. Anyone have ANY ideas what this could be?

[Mozoby]

maybe try cleaning the O2 sensor?

if that was the problem im not sure it would get better when the car warms up.. but its worth a try

[statickx991]

what is the car tuned with? reason im asking is, could be a bad cold start tune since some ecu's like my old pfc went by degrees i belive. i could be wrong tho

[nurevem1]

the o2 sensors are both reading and im sure would throw a code if they were out of spec.
The car is tuned with the Apexi AFC NEO. I was also thinking that the tune could be the issue but wasnt sure. maybe i should take it to the performance shop near me and see what they think