4Runner Intake Manifold Issue

Hey, I had something like that happen in my 4Runner. I didn't have the hissing sound, but the reduced power and jerking were definitely there. Was a pain, especially on hills. You mention the intake manifold, that's interesting. What makes you think that's the culprit?

I suspect the intake manifold flap control because of online research and the service manual. The symptoms – reduced power, rough running, jerking, and elevated fuel consumption – align with malfunctions in the intake system, especially the manifold flaps regulating airflow. The hissing could be a vacuum leak worsened by the malfunctioning flaps. When you experienced similar symptoms, did any diagnostic codes appear, and how did you resolve the problem?

Okay, that makes sense. I didn't get any codes, which made it even more annoying to diagnose. The mechanic I went to eventually figured out it was a problem with the intake manifold. He said something about the flaps not opening and closing properly. Honestly, I'd suggest getting yours checked out by a professional. It's tricky stuff to mess with.

I appreciate your recommendation. Based on your advice and the escalating symptoms, I've decided to bring the 4Runner to a trusted workshop for a thorough diagnostic assessment. The repair ended up costing 465€ due to the intake manifold control needing replacement. Thank you again for your time and assistance. It's invaluable to have a community of experienced owners to turn to for guidance.