Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 1997 Nissan Pathfinder 4X4 – rough idle › Reply To: 1997 Nissan Pathfinder 4X4 – rough idle April 30, 2023 at 4:44 pm #1024875 Rahul JonesParticipant Have you checked for vacuum leaks? That hissing noise you mentioned can also be a vacuum leak. Also, I would suspect the idle air control valve is getting an internal block, sticking intermittently or going bad.