Question about 1994 Mitsubishi Galant

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Idleing Problem In park it idles up and down 3000 back to 1000 and up again sometimes when I'm driving it feels like it wants to drive itself with the idle raising and dropping and sometimes it does not do this at all and acts normal. not sure what this could be? and if it could have anything to do with why I keep failing emissions test?

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  • kim51581 May 21, 2009

    Where is that located and how much does it cost to replace

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Sounds like your upstream o2 sensor is shot causing an incorrect signal to the ecu throwing off you fuel/air ratio, you need to do a diagnostic scan for fault codes to see exactly what it is. If it's the o2 sensor be sure to replace it with an ORIGINAL , you will get the same problem with those universal o2 sensors.

Posted on Feb 26, 2013

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IAC valve. It regulates your idle.

Posted on May 21, 2009

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