Q: Idle problem and shutting off.

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I have a 2003 mercury mountaineer the Idel was going up and down when I was sitting in park the part store put it on there tester last night and said it showed my oxygen sensors have failed.. now when I put my truck in park the rpm will go from between 0-1 to between 1-2 and go back down and back up then it shuts off could it just be my oxygen sensors

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