Idle air control valve?
 

I have a problem on my 4.4i that when it's cold or at a stop light the engine likes to misfire. Doesn't throw a code or anything other than the noticeable vibration of a cylinder missing. I figured it was a IACV just because when I get going it doesn't misfire in fact it drives perfect.


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I am here: http://maps.google.com/maps?ll=30.221088,-95.572105

The idle air control valve never goes bad on this engine. Look elsewhere.