Your Denali has
Throttle Actuator Control (TAC) System - Electronic throttle control ! Are there any messages on the driver information center ? Reduced engine power ?
Reduced Engine Power Mode
When the PCM detects a condition with the TAC system the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
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Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
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Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
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Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
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Forced idle mode--The control module will perform the following actions:
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Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
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Ignore accelerator pedal input.
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Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.
You need to have it checked for DTC'S - diagnostic trouble codes , probably a
accelerator pedal position (APP) sensor or TPS - throttle position sensor !
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