JK Feather Ranch | Mustang exhaust smoke @jkfeatherranch | Uploaded December 2018 | Updated October 2024, 2 hours ago.
Posted for demonstration purposes only, but I'll leave it up in case it helps anyone. If yours is doing this (smoke but only when you give it gas after idling) then your valve seals are bad. I was able to fix it and no more smoke ever :)