Traxxas Glow Plugs are an important part in maintaining peak performance in your Nitro engine. Glow plugs can get weak and actually have what Traxxas refers to as a "Burnt Plug". A burnt plug occurs when the glow plug element is actually broken. Both weak and burnt plugs can cause hard starts and poor performance. The Traxxas glow plug is the only glow plug that Traxxas recommends running in your Traxxas nitro engine.