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mine only does that when its cold outside the IAC valve (Idle Air Control Valve) does this sound, it is caused by an air leak. this is the black round piece by the firewall, it cost about 55 dollars at autozone. it is very easy to change it is held in by 2 bolts ( 8mm if i remember right)

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โˆ™ 2007-11-29 05:46:03
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Q: 1999 mercury cougar -what is the fog horn like sound mean after it is started?
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