Here are a few pictures from the first part of my project today. A few days ago, I noticed that I was low on coolant, so I decided to replace the OEM manifold with an Dorman aftermarket unit before the problem gets any worse.
My first sign of troubles.
Coolant leaking around the base of the upper manifold and EGR pipe.
A throttle in need of cleaning.
The lower manifold covered in oil and coolant.
If you look closely at the coolant passage on the right, there is a hole between it and the EGR pipe.
A comparison between the OEM manifold on the left and the Dorman manifold on the left. Notice how the ports are more reinforced around the EGR pipe on the aftermarket unit.