The customer reported that the vehicle intermittently cuts out, has a rough idle, and vibrates when driving. The issue is most noticeable after the engine reaches operating temperature, especially at low speeds or when cruising at around 50 km/h.

The vehicle starts and runs fine when cold. Once warm, the engine develops a rough idle and noticeable vibration, then briefly recovers before repeating the cycle. A P0300 multiple cylinder misfire code is logged each time the fault occurs and can be cleared, but always returns once the rough running begins.