Q: Crazy idle

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I just got this car and the owner said he replaced the throttle body on it and when you start it the idle will be normal until the temp goes up and then it will go up then back down then jump up and go back down and continues doing that until you put it in gear then while driving if you push the gas to fast it will start surging and no power when you hit the gas you have to let off of it for a minute and then works again what would cause all that

My car has 137000 miles.

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