Engine Reduced Power massage ! Has to do with the electronic throttle control ! 04 Silverado REDUCED ENGINE POWER Case Study Part 1
ENG PWR REDUCED
Refer to Throttle Actuator Control (TAC) System Description for the 2.2L engine, Throttle Actuator Control (TAC) System Description for the 3.5L engine or Throttle Actuator Control (TAC) System Description for the 3.9L engine
Your best bet is to take it to a ASE certified repair shop !
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