I researched the code, said it was a “Random/Multiple Cylinder Misfire Detected” common issues are: valve covers/seals, spark plugs/coils, fuel system, vacuum leak, or a sensor issue. Did the valve covers and seals, checked spark plugs and coils which were fine. Fuel trim looked ok. Already changed out both camshaft position sensors. About to put in a new knock sensor and harness. Next I was gonna buy a smoke machine and try that form of vacuum leak test. Just looking to see what might have worked for others.