Subaru Legacy persistent hesitation and misfiring in cylinders 2 and 4 despite recent repairs on Subaru Legacy

Some Subaru Legacy owners report experiencing persistent hesitation and misfiring in cylinders 2 and 4, even after recent repairs. These misfires may indicate underlying issues specific to those cylinders, potentially linked to problems with the injection molded intake manifold, where faulty connectors or injectors could lead to such symptoms. Additionally, some owners find that bad injectors can cause similar misfiring issues, as evidenced by cases involving multiple faulty injectors. Intermittent hesitation, characterized by a loss of power at idle or during acceleration, can stem from various factors, including throttle position sensor, air sensor, or CO2 sensor malfunctions. A faulty CO2 sensor can particularly impact the ECU's performance, exacerbating hesitation and overall performance problems. To effectively address these issues, it is crucial for owners to diagnose the specific reasons behind the misfires in cylinders 2 and 4, as well as to check trims and sensors using diagnostic tools to identify air-fuel correction problems.