What are the signs of a bad throttle body? 7 Symptoms of a Bad or Failing Throttle Body Lack of Power. Issues while accelerating. Higher or Lower Idling. Dirt or Grime Build-up. Poor Mileage. Electrical Problems. Check Engine Light. via By brujasdeaskaniJune 6, 2022tipsLeave a Comment on Buick Enclave Throttle Body Replacement