A rough idle is also a very common symptom. So, the symptoms of a bad throttle body will all affect how the vehicle feels responding to your throttle input. You control the throttle body position with the gas pedal. Your Beetle’s throttle body controls the amount of air that enters the engine.

Common symptoms of a bad throttle body include dirt and grime, the check engine light, and an erratic idle.

If your Volkswagen Beetle has a faulty throttle body, it can cause it to run terribly.