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Check your engine error codes. It may be that your transmission range sensor is going out of whack, and you will need to replace it. Or, it could be several other things, but the only way to find out is to check the engine error codes when the check engine light is on.


You can borrow a code reader at many auto parts stores if you give them your license. You just plug it into a clip near the fusebox under the steering wheel.

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Q: What would cause 99 mercury mystique to slip out of gear at steady speed only when warmed up?
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