HiCustomerthis is lostrider,
~Has the battery been disconnected or replaced lately?
Thank you for the reply, since the battery went dead, the Processor lost its memory, so with the sludge build up in the electronic throttle body the processor cant relearn properly, there is a calibration update that needs to be done to the processor and then the throttle plate angle needs to be checked and if its out of range the throttle body will have to be replaced, there is a service bulletin for this concern and unless you have an extended warrenty that will cover the repairs it will be at your expense to have the repairs done, The dealer is the only place that has the ability to recalibrate the processor, here is a copy of the service bulletin, hope this helps.
Some 2004-2006 4.6L and 5.4L F-150 (excluding F-150 Heritage), 2006 5.4L Mark LT, 2005-2006 6.8L E-350 / E-450, 2005-2006 6.8L F-Super Duty (F-250 to F-550), 2006 6.8L F-53 Motorhome Chassis, 2006-2007 4.0L Explorer 4 dr, 2007 4.0L Explorer Sport Trac, 2006-2007 4.0L Mountaineer, 2006 4.0L Mustang, 2006 - 2007 4.6L 3V Explorer / Explorer Sport Trac / Mountaineer, 2006 4.6L 3V Mustang, and 2005-2007 Crown Vic / Grand Marquis / Towncar vehicles may exhibit one or more of the following symptoms: drive-away hesitation, loss of RPM on deceleration, difficulty starting, and/or idle RPM less than desired. Malfunction indicator lamp (MIL) may be illuminated with diagnostic trouble codes (DTCs) P0506 and/or P0505. These conditions may appear after battery disconnect, dead battery condition, or keep alive memory (KAM) reset. The symptoms may be due to engine deposits in the throttle leading to airflow less than desired.
Follow the Service Procedure steps to correct the condition.