Originally Posted by NickMac
I changed my egr probably a year and a half ago before I put the stainless magna flow system on... I'll check the vac lines tomorrow
It's probably had enough time to build up some carbon inside.
Just make sure it operates fully and there are no leaks.
Sometimes the replacements you get are not of the best quality too.
P.S. If you have never changed out the O-rings and caps on your injectors, now might be a good time to do that and make sure none were ever left stuck inside the fuel rails and the intake ports.
A vacuum leak around them can cause idle problems too.