Found this 2006 V10 procedure for you
A dirty throttle body can cause a low idle condition after disconnecting the battery. The engine computer will "learn" a new idle position over time as deposits build on the throttle body. When you disconnect the battery this memory is lost. The computer should relearn the idle speed fairly quickly. To help it along try the following: Warm the engine (hold the idle up with the gas pedal if necessary). When the engine is warm slowly release the throttle until the engine will idle on its own, let it do do for about one minute. Next with your foot on the brake place the transmission into drive and let the engine idle for another minute. Next with the trans in drive turn the a/c on for another minute. If this procedure does not restore the correct idle for your 2006 Ford F-250 Super Duty you can try cleaning the throttle body deposits by spraying some carb cleaner on a rag and wiping the throttle bore.
