There are periods of time when the engine will run incredibly smooth and quiet. Then it will run rough like it’s missing a little or injector is knocking. Seems to run rough more often now. Would this be a wiring harness issue?
I would suspect aeration of the fuel. This is typically caused by dry rotted fuel lines. Can be intermittent too. Sometimes the cam sensor can start to go bad but not bad enough to log a fault code. Certainly, bad or dirty electrical grounds can cause issues like this too.