When the Z is idling for a longish period of time (45 seconds to a minute) its starts acting like it wants to die. It dips down to 500 rpms - 250 rpms and shakes a lot then goes back up then starts going back down until I start to drive again. It also does this without fail when I have my heater or AC on and I come to a stop (I have to turn off my heater/AC when I stop now) or else it will immediately start acting like it wants to turn off.

It has already cut off on me twice.....anyone know wtf is up? Could it be a dirty air filter? My air filter is pretty damn dirty but Im just waiting until this weekend because I get my new intake set up (in the mail).

 

Happened to me when I took the Z out for the first time this spring.

At a stop light I looked down and my RPMs were dipping low.

I'm gonna try cleaning the MAF and related stuff and see if it helps.

 

Sounds like you have an idle re-learn problem,,(have you recently had to change or disconnect the battery?)if so you may need to visit the dealer so they can reset your base idle.....if you were closer i would hook you up but kind of a long drive for you im sure....good luck..

 

'') do you know what kind of tool they use to reset the idle??
My Z is in Korea and Samsung sells rebadged Nissans... mayeb i can get it reset there.
My car does that too and after i took it to korea with different fuel and all and i have to hold on the gas to keep it idling stable.

 

its called consult 2..its a scanner and lets you reset ecu parameters

 

Try this first: http://www.technosquareinc.com/350reset.htm

 

worked perfect for me after a battery change, car wouldnt even idle now runs like a top

 

I'm having a similar issue but my car was throwing a P0300 code after a spark plug change and injen filter replacement. I cleared the code and did the relearn and the problem isn't as bad but the car still has an irregular idle. If you find a solid solution please let me know.