I have a 06 gt mustang 4.6 that has lost half of her throttle response what can it be??
I the "Check Engine" light on? There's a possibility that you have a failure in your Fly-by-wire throttle system (Gas Pedal or Throttle Body Actuators), a fuel supply problem, or plugged Catalytic Converters. If the Throttle system has any error at all - the Computer will command a "reduced power" state so the car will perform safely and still get you home. Read the Diagnostic Trouble Codes and get back to us.
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