Ford 2003 Mustang Workshop Manual page 2993

High engine idle
speed
Foreign object
caught in
accelerator
pedal linkage.
Worn or
damaged
throttle body.
Kinked
accelerator
cable.
Foreign object
caught in
accelerator
pedal linkage.
Incorrect engine
idle speed.
CHECK the accelerator pedal
linkage.
INSTALL a new throttle body.
REFER to Section 303-04A
Section 303-04B .
INSTALL a new accelerator
cable.
CHECK the accelerator pedal
linkage.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual for diagnosis
and testing of the idle control
system.
or