I would also suggest looking at the camshaft position sensor (CMP). The CMP sensor plays a crucial role in synchronizing the fuel injectors and ignition system with the engine’s camshaft position. If the sensor is faulty, it could cause the PCM to misfire or provide incorrect timing, leading to rough idling and misfires.

The CMP sensor is located below the alternator on the timing chain cover on the right/front side of the engine. You can start by checking the electrical connector to ensure it’s securely connected and free of corrosion. If that looks good, you might need to test the sensor itself or replace it if necessary.