INFINITI M37 engine running hard while driving issue under investigation on INFINITI M37

Some INFINITI M37 owners report experiencing issues with the engine running hard while driving, which may be attributed to common causes such as vacuum leaks, spark plug issues, or ignition coil problems that lead to a rough idle. Additionally, problems with the ignition cylinder or exhaust gas oxygen sensor can result in irregular engine performance and misfires during acceleration or low revs. Symptoms like engine stalling, backfiring, and hard starting have also been reported, indicating that these engine issues may require prompt attention. Furthermore, alternator problems can impact the electrical system and subsequently affect engine performance. Some drivers have noted transmission shifting issues in various INFINITI models, which were addressed through technical service bulletins, while others have experienced the engine feeling like it is in limp mode, with intermittent ignition or fuel cut-off that can be temporarily resolved by restarting the vehicle. Diagnosing these specific symptoms can aid in effectively resolving the hard engine running issue in the INFINITI M37.