Why does my idle up and hesitates ? on 1997 Toyota Avalon

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When you start the car, it idles very high at 2,2 rpm. When you take off it hesitates. Why does this happens?
(3) Answers
Light in dash on! Scan test needed to ckeck throttle position sensor!!
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poss vac leak at intake manifold?
I agree check intake manifold for leak. Let car idle then spray carb cleaner where intake meets cylinder head and around any vacuum hoses if idle changes you found leak.
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