I have a 2003 nissan 350z and in need of desperate help :\.... i just recently got my car read and it said to change my "Sensor A Bank2 " so i did so because my car kept on stalling and running horrible . now since i changed it everytime i turn on my car it cranks up perfect but than the idle just drops and loses power but the weird thing is if turn on the car than immediately press the gas two hold the idle up on 1 rpm and let go just for a QUICK second the car stays on n runs perfect....any ideas THNX

 

How bout some more, clearer details? Exactly what "sensor A Bank2" did you change? Did you do anything to the throttle body? Any more codes being thrown?

 

i try to turn on car dies. car stays on if i turn car on hold gas for 1 sec and let go

 

camshaft sensor a bank 2

 

Be a little more specific if you can, please.
Anyways, I am assuming the "Sensor A Bank 2" is referring to the drivers side O2 sensor, which is housed right after the catalytic converter on the underside of the car. Replace that if you haven't.

That will take care of the OBD2 reading. However, I am getting the idea that the O2 sensor is unrelated to the idling/turning problem..
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1. Check for vacuum leakage. Use start gas to spray over the gaskets at the intake. If the engine stabilises or change the idle there is a leakage. Check all vaccum hoses.

2. Check also that there is no punture of the corrugated tube from the MAF to the throttlebody.

(preferably take the throttlebody off to have easy access for the point under)

3. Clean the throttlebody. Behind the butterfly blades there is carbon deposites. If there are deposites it will infuence the idle.

4. Take the IAC valve out. It sits on the right side of the throttle body with a small plug. Look at the pintle and clean it Spray carbon deposit cleaner ( carburator Cleaner) in the the hole where the IAC is screwed in. With a cotton cloth clean the seat of the pintle. If you have compressed air use this to blow out the rest of the deposits.
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That's just my $.02, I am not sure that this will solve your problem, but It will narrow down the possibilities.

 

Did you disconnect the battery?

I have a 2003 and often when I disconnect the battery, exactly what you are describing happens. It seems the system has to re-learn itself and it always goes back to normal in a matter of a week or so.