So I just brought my 350z out for spring it has a weird rough idle when sitting at lights for like 2 to 4 seconds the rpms drop a little bit when this happens kinda like bogging downish then goes back to normal no codes at all right now it has new coils and new spark plugs replaced a month or 2 before winter any help would be appreciated thank you

 

What year Z?

Could be something simple like a dirty MAF sensor or Throttle-body. How many miles? 6MT or AT?
Where did you source the coils/plugs? Are they OEM coils and mfg recommended plugs (NGK)?

You mentioned you brought it out for the spring, I suspect it was in winter storage? Make sure you have solid battery voltage and your charging system is working properly. Also check around for rodent signs. Make sure you've got some fresh premium fuel in there.

Cheers!
-Icer

 

I did some digging around and turns out it was a evap leak hose slipped off intake tube got it clamped now so that won't happen again haha 😅 its running smooth now at idle with no drop

 

I did some digging around and turns out it was a hose, slipped off intake tube got it clamped now so that won't happen again haha 😅 its running smooth now at idle with no drop

 

Ahh, vacuum leak then from the PCV system. I was thinking that, but usually a vacuum leak will cause a high idle issue, not make it drop low. Glad you found it!
-Icer

 

anyone have a pic of what this hose looks like in the engine bay, i have the same issue.

 

@Anthem350z it's an S-bend hose that connects between the back of the bank 2 (driver's side) valve cover and intake tube. Assuming you have a VQ35DE and similar to stock intake tube it should be very easy to identify as it's the only hose that connects directly to the bottom of the intake tube between the throttle body and MAF. Note: If using an aftermarket intake tube, not all are created equal, some delete provisions for the PCV system.
Hope that helps.
-Icer