If your engine is leaking oil, there is a good chance it is coming from the valve cover. My engine was leaking from all sides of the cover. When the cover leaks from the aft side, it can leak down in the area near the rear main seal where the engine and transmission mate. This can have the appearance of a rear main seal leak, but it is always best to check the valve cover first to prevent unnecessary work. I recommend using the Fel-Pro gasket for this job because it simplifies the process and provides superior leak protection. This job is not complicated and requires just basic mechanical skills. It can be done with one person, but an assistant would be helpful. A ratchet set, screwdrivers, torque wrench and a plastic scraper will be needed for this job.
It is a good idea to take pictures or notes throughout the process to avoid confusion during installation. Raise the hood and disconnect the battery. It is always important to disconnect the battery when working under the hood to prevent accidental shock, damage, or activation of systems. Remove the wire harness trough from the driver side of the valve cover. You will have to rock it back and forth while pulling up to detach it from the three engine block screw threads. Detach the heater hoses from the holding bracket on the passenger side of the valve cover and pull the bracket off of the valve cover screw. Remove the spark plug wire holder from the passenger side of the cover. Remove the three bolts from the throttle cable bracket on the driver side of the engine attached to the intake manifold. This will allow enough flexibility to remove the cover without detaching the throttle cables. Detach the forward cover breather element line from the air cleaner assembly and turn the element 90 degrees counter clockwise to remove it from the cover. Detach the aft cover breather element line from the intake manifold. It is not necessary to remove the element from the cover. Note: The breather element lines are made of rigid plastic and are easy to break. I broke my forward element line and replaced it with a 5/8 inch rubber line which is a much better setup. Remove the cover mounting bolts. Make note of their location because the sizes and types vary. The aft bolts can be difficult to remove because of tight space between the firewall. A universal socket adapter and extension will assist in this area. If the cover is tight to remove, lightly tap it with a rubber mallet or wooden object to loosen it up. Do not use sharp objects to pry it off because you may damage the mounting surface and cause leaks! While holding the throttle cables up, carefully remove the cover. Be careful not to damage any wiring, hoses, or vacuum lines during this process. Use your plastic scraper to remove all of the gasket material from the engine block and cover. Make sure both surfaces are clean and smooth.
Follow the installation instructions included with the Fel-Pro gasket. Lay the gasket on the block making sure it is aligned properly with the appropriate side facing the cover and engine block. The remainder of installation will be the reverse of removal. It is best to hand tighten all of the cover bolts first prior to fully tightening down any bolts. Torque the cover bolts to 55 in-lbs. Note: It may not be possible to torque the aft bolts due to limited space. If so, you will have to tighten snug by feel and avoid over tightening.