That low a mileage suggests lots of short trips, I'm sort of leaning towards a dirty EGR valve/tube.
I'd probably run a couple of tanks with Seafoam added, if that did not help any at all I'd be back looking at the EGR.
Take care and enjoy the ride,
Greg
I'd probably run a couple of tanks with Seafoam added, if that did not help any at all I'd be back looking at the EGR.
Take care and enjoy the ride,
Greg