Vacuum leak, erratic idle

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! A loud hiss and erratic idle are like your Sequoia's way of saying, "I've got a secret, and it's leaking!" If the hiss is coming from the top of the engine near the starter, it's likely a vacuum leak. Check the vacuum hoses and intake manifold gaskets for any cracks or loose connections. It's like finding a hole in a straw; even a small one can cause big problems. Also, inspect the PCV valve and its hose, as they can be common culprits. Once you find and fix the leak, your idle should smooth out like a jazz saxophone solo. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.