Idleing high wont stay on in reverse and at stop signs and stop lights
Make sure there are no broken hoses on the intake manifold, or anywhere else under the hood. There are many hoses of many different sizes to be considered,, so check them all. Listen for rushing air, or a whistling sound. If you suspect an intake leak, briefly spraying small amounts of WD-40 ( without the long red straw attached) at a leak will change the speed of the idle....this would indicate that you are on the right track. A leak would cause a high idle, but maybe not enough power to keep the car running under load at low speed. As unwanted extra air is introduced into the manifold from any source, the fuel mixture can get leaned out causing a higher idle and a loss of power. Good luck.
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