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May be due to a faulty airflow meter. If the pot on the side of the airflow meter is sending a incorrect reading then the idle valve is going to try and compensate for the new value its reading. Use a ohm tester to test and see if there are any fluctuations around the idle range while pushing up and down on the plunger slightly. If the value doesn't imcrease linearly with the pressing of the plate then the air flow meter is probably the problem.
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