No to the exhaust. THe egr is on the intake manifold and has a vacuum line running to it. That could be the both (vacuum / EGR) problems together. Many times with the engine running, you can hear a hissing noise where there is a leak. Give that a shot.
As far as the #3 cylender, you need to remove the spark plug and let me know how it looks. It may need replaced as well as the plug wire. Here is a picture to help locate it.
Let me know if this helps.
Monday, November 5th, 2018 AT 5:09 PM