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My car idles at a high rpm and makes a strange noise while idling and driving. on 2001 Toyota Highlander

My car has always idled at around 1000 rpm, but recently it started making a strange noise while idle and while driving between 1000 and abour 2500 rpm. It stops when I go faster, btu when driving low speeds it sounds like the car is humming almost. Any advice? No emergency lights have come on.

Asked by for the 2001 Toyota Highlander
poss air intake leak or idle control valve is going bad
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