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Might be a Throttle Position Sensor. Your best bet would be to hook it up to a computer and check for any codes. OR... you can hook up a multi meter to the tps plug and check the voltage sweep. 5v. max at wide open throttle! Set the meter to check resistance or ohms.

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14y ago
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Q: Why does the idle fluctuate between high and low after warming up on your 99 mercury mystique after changing plugs wires pcv valve and air filter?
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