http://www.svtperformance.com/forums...-solution.html
Here it is. I talked to my buddy at Ford about this a while back and it is common, he also said they will fix it under warranty if you're still covered. I would advise you to let them know about the fix in the link just in case they aren't aware. it would suck to send your car in just to get it back with the same problem. Good luck.
Mods, maybe a sticky on this problem? It's been mentioned a few times now.