One problem related to speed control springs has been reported for the 2003 Subaru Outback. The most recently reported issues are listed below.
Accelerator on vehicle stuck on interstate highway. Tried to put vehicle into neutral however rpm's spun to 7000. Had to eventually turn car off in drive after riding approximately 2 miles with both feet on brake. Dealership unable to identify any issues, and told me "it'll probably not happen again".