Low performance like this seems to indicate the timing chain was installed without the dots on the upper and lower pulleys aligned properly. That will cause the symptoms you described with poor performance and lag off the line, and the EGR issues since the valve timing is not right. I'll bet your fuel consumption is up as well.
Did you look at the dot alignment when you did the timing chain? If not, you'll need to pull the cover and look at it. It's a pain in the rear, but important.
Did you look at the dot alignment when you did the timing chain? If not, you'll need to pull the cover and look at it. It's a pain in the rear, but important.