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Q: Idle too high on 1997 Buick LeSabre

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What causes it to idle to high(egr Valve)
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It is usually a problem with the idle air control valve. There should be a Service Engine Soon Light on, which will indicate there is a trouble code in the computer which will be a code P0505. If the EGR valve was sticking, which is an electronic type on this car, the car would tend to die at stop signs and idle rough, though the idle air motor would try to make it idle and it would be rough. Does it idle smooth or rough?
i replaced the motor in my 99 chryler concorde when i start it it goes strait to wide open runs high
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