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Kia Muhave V8(4.6L) feels hesitation on acceleration.

fault code P0638 Throttle Actuator Control Range/Performance

wiring and ETC motor is checked and seems fine,
when ignition is on and engine off, depressing the accelerator pedal moves the throttle actuator and throttle position sensors have normal responses, but when engine is idling throttle actuator motor opens maximum 15% with flooring accelerator pedal.I use GDS scanner.

after deleting the fault memory, P0638 comes back immediately without start the engine.

Any useful idea would be appreciated.
 
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