Originally Posted by
paul100
I'm not sure when/why the EGR valve cycles but could it be that the valve was just "resetting" itself after having been unplugged, removed, cleaned and replaced?
thanks
No.
They made EGR valve improvements in 2007. If yours is the original, I would buy a new one for the trip. I installed a new one in my 2006 last a few years ago. One of the improvements is a stiffer spring.
Problems immediately after the work quite often have a connection to the work. Not sure how, but it and the symptoms seem to point to the EGR valve.