I recently installed the comp 503 cam, 1.6 rr, lt headers and had the pcm tuned for all of this. The only thing i dont't have for this yet is my o2 extensions. So my question is why won't my car idle with the MAF sensor pluged in but when I unplug the sensor it will idle at 750 to 800? I have already tried a new TPS sensor and a new idle air control valve. Is this because i don't have the o2s hooked up?

 

I would say you have a bad MAF, Your car doesnt use the o2 sensor on initial start up, the o2s com into play when your car is running in closed loop. Hopefully some one else will chime in aswell.

 

got the o2 extensions today hooked them up but nothing changed. I tried my buddys MAF sensor had the same problem.

 

You are SOL :d