i had this on my mustang too. It happens with some tunes. I spent days trying to track down vacuum and boost leaks and found nothing. Are you running a tune? stock tune? Maybe unplug battery for a while and let it learn idle again?
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2010 370z Touring | K&N Typhoon
2013 Mustang 5.0 | 650 rwhp (sold)
2011 Mustang V6 | 270 rwhp (sold)
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