IDLE pulsing problem

[MOVEIT]

Hi all,

Im fairly new to all this, i apologise if this has already been answered however i need some help. 

I have a 1995 r33 GTR V Spec. 

Fairly stock other than an exhaust, Pod filters and power FC. 

A few months ago, it started doing this thing on idle mainly when its warmed up:

Revs normally on idle and revs just randomly pulse down slightly and then back to normal. (never to the point of turning off) 

My Mechanic thinks it could be a tuning issue. 

I have attached a video. 

 

Thank you! 

 

 

 

 

[GTSBoy]

Dirty IACV.

[MOVEIT]

Thanks for your response. 

Is it hard to get to and to clean?

Also, just confirming by video works? 

[GTSBoy]

I didn't play the video. Unstable idle speed where it jumps up and down is almost always a sticky IACV caused by it being dirty.

It is a complete pain in the arse to get to. It is under the plenum.

[MOVEIT]

Thanks 

 

Ahh Damn, was hoping it was easy to get to. 

Looks like it will be a job for my mechanic.

 

Thanks!