Whenever the car is in park and idling the RPM's dip below normal idle... The car noticeably shudders when the RPM's dip. I have Stillen Gen 3 Cold Air Intakes and an HKS exhaust but they have been on for a while with no problems. Car is a HR 350Z. Any idea on what could be causing this?


Happens at about 24 seconds in.

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Can be seen in the very beginning of this video.

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start off by cleaning the maf and checking vacuum lines and exhaust for leaks

 

might even want to leave the battery disconnected over night to reset the ecu