general problems of the 2003 Subaru Outback

Subaru Outback, 2003, 4-cylinder with 90,000 miles s/n: [xxx] significant acceleration from very slow speed; turning off the engine was the only method of stopping the car. Drove through garage wall; occurence over six months; about one-time per month. Progressively got worse until the car went through the garage wall. Per dealer: "significant carbon build-up in throttle housing & idle control valve. Carbon build-up caused by reformulated gasoline. " repiar action: clean throttle housing & replace idle control valve = $ 750. 00 at may 11, 2010. No service bulletins or history, per dealer. My comment: "potential disterous safety issues: not only property damage, but significant personal injury could be caused if this happens in parking lots, crosswalks, driveways, etc. " [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).