Cadillac ATS misfire issue when idling not corrected on Cadillac ATS

Some Cadillac ATS owners report experiencing misfire issues while idling, which can lead to a lack of power and rough idling. These misfires may be identified by swapping ignition coils and spark plugs between cylinders to pinpoint the problem. Additionally, some owners utilize diagnostic tools like Tech2 or GDS to perform injector tests for further analysis. It's common for drivers to notice a malfunction indicator lamp (MIL) accompanying the misfire, particularly during cold starts, and the issue may affect one or multiple cylinders without being immediately noticeable. Signs of rough idling, such as changes in engine tone and fluctuating RPMs, can also indicate underlying problems. To confirm if piston leakage is the cause of the misfire, some owners conduct a leak down test on the affected cylinder and visually inspect spark plug and coil connections. If these issues persist, it is advisable to consult a professional mechanic or dealership for further assistance.