Hi all,
I have a mysterious misfire situation with my 2013 Outlander Sport (145k miles). Running rough at idle when cold and throws a misfire on 3 code, smooths out a bit at speed when warmed up. I've already replaced plugs, coil on cylinder 3, swapped injectors trying to track it down but symptoms persist!

My next step is to check the valve train. I'm suspecting maybe a failed HLA or rocker? I'm wondering if anyone has had something similar to this.

Thanks!