Also asked, what are the symptoms of a bad throttle body?
When a throttle body is not functioning correctly, some noticeable characteristics may be poor or very low idle. This can include stalling when coming to a stop or very low idle after starting, or even stalling if the throttle is quickly pressed (resulting in the throttle body plate opening and closing very quickly).
Correspondingly, what happens when throttle body goes bad?
If the throttle body isn't supplying enough air to the engine, you may see a lack of acceleration power and poor engine performance. 3. Your car idles poorly: The amount of air entering the engine affects idle speed and quality. A faulty one can cause rough idle, or it can cause the engine to race at idle.
Sadly, this difference will most likely be in the neighborhood of a couple horsepower – not enough to register an increased seat-of-the-pant feeling. For this reason, throttle bodies are not considered to add power. Also if your install too big of a throttle body, you can reduce your Mustang's power.