Mercedes-Benz ML320 runs rough after 10-12 miles, issue not corrected on Mercedes-Benz ML320

Some Mercedes-Benz ML320 owners report experiencing rough running conditions after driving 10-12 miles, which can be attributed to various underlying issues. These owners have noted that problems within the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump, may lead to these performance issues. Additionally, issues with the ignition system, including faulty spark plugs or ignition coils, can also contribute to rough idling after a certain distance. Some owners have found that even after replacing the EGR valve, the vehicle continues to run roughly, suggesting other related components may be at fault. Furthermore, a dirty air filter can impact engine performance and cause rough idling, while deteriorating spark plug wires, especially as the vehicle ages around 80,000 miles, can lead to misfire codes. To resolve these persistent issues, it is advisable for owners to systematically inspect and replace components within the fuel, ignition, and air intake systems, ensuring optimal performance and a smoother driving experience. Regular maintenance and timely replacements of worn-out parts are essential for addressing these concerns.