I would Isolate EGR system from Engine.
opcorn:
The EGR system has a EGR valve,a selonode switch,and a feedback sensor.
1) Get gasket material and EGR gasket from the local parts store.
2) Copy the EGR gasket,but don't cut the hole in the center.
3) Pull out EGR valve enough to slid in homemade gasket.
4) Bolt the EGR on tight.
5) Make sure you connect the PCV valve to Intake TOO.
This will block EGR port going to the Intake,you will pick up horsePwr.
IF there was any leaks going to the Intake,because of faulty EGR system!
It will not leak now!
MCGIVER