Customer Spends $1000 on Parts...Still Not FIXED! (Subaru High Idle)

This 2005 Subaru Forester is a fantastic snow car, except it has one DANGEROUS problem: The engine refuses to IDLE DOWN, racing to 3k rpm on its own! Owner says he has burned through two sets of brake pads going down his 20% grade in the West Virginia mountains because the car cannot engine-brake! Over the last 6 months it has been to the shop several times and the PARTS CANNON has been unleashed: throttle body, ECM, sensors...you name it. Lets perform an actual SCIENTIFIC diagnosis and see what the root cause of the problem really is! THINK TOOL PROS: https://www.amazon.com/dp/B08XXWHQVJ?... DEOXIT CONTACT CLEANER: https://www.amazon.com/dp/B00006LVEU?... Enjoy! Ivan