BMW 535i inconsistent idling issue on BMW 535i

Some BMW 535i owners report experiencing inconsistent idling issues, often attributed to factors such as vacuum leaks and spark plug failures. Owners of high-mileage vehicles, particularly those over 100,000 miles, may notice rough idling due to aging components causing vibrations that transfer into the chassis. Specific cases, such as a 2014 BMW 535i xDrive owner, have reported irregular idle motion at startup that eventually stabilizes. For those facing persistent rough idling, effective repair solutions have included replacing fuel injectors, spark plugs, and low-pressure fuel pumps. It is crucial for owners to systematically diagnose the problem by checking for fault codes and inspecting components like the cam position sensor, while also addressing potential issues such as leaking fuel injectors.