Symptoms of a Bad or Failing Throttle Body 1. Grime buildup 2. Electrical problems 3. Airflow disruptions 4. Poor or high idle 5. Worn-out Butterfly valve 6. The ominous check engine light 7. Lack of Power 8. Issues while accelerating 9. Poor Mileage How to Clean a Throttle Body Step 1 Disconnect the air duct .
