One problem related to car throttle stuck has been reported for the 2012 Ford Fiesta. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Ford Fiesta based on all problems reported for the 2012 Fiesta.
My throttle body stuck open. The fusion and the escape has an extended warranty required by you but you did not include the Fiesta. Same issue. Sitting at a stoplight and my car revs between 2,000 and 3,000 rpms. It went above 3,000 rpms a couple of times. I luckily had my own extended warranty so it only cost me $100. 00 to fix it but the Fiesta (and probably any Ford made in those years) should be covered. It was super scary. Luckily my engine is a manual transmission so I was able to put it into neutral and not get into any car accident. (an automatic transmission would have a big problem).