I have exactly the same problem happening now on the driver’s side. There are 2 extra rubber pipe connected to the cover, anything I should watch for when disconnecting them?

Another question is where the EGR valves? I also have a rough idle problem and I am thinking a clogged EGR valve. And because the clogged EGR valve, there are too much pressure under the valve cover, hence the oil leak. Does it sound right?