Yep, they do that. It's a horrible sound if you get your ear up close.
Possibly a vacuum leak of some kind. Search this group for vacuum leak.
How high is the mileage? Last one I saw that did it was at 280,000 Km.
Cleaning the throttle body might fix it too. Have you inspected your air
filter? You know to get your valves adjusted WAY before the Owner's
manual says, right? Same for the rear diff fluid.
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