Personally, I would pull the codes (http://www.dfwmustangs.net/forums/showthread.php?t=7908) myself. Depending on the array it should be pretty obvious one way or the other. Even if it is "fried" it usually is pretty simple to fix.
Yeah last year i had EVERYTHING changed out to brand new parts on my coupe. and lead me to beleave it was the ecu. went to oreillys and got one brand new and fixed my idle issue.
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