Removing the intake manifold
The intake manifold removal process must be done prior to a valve lash adjustment, for the "by hand" method of intake manifold cleaning, and is optional (depending on your flexibility) for spark plug replacement.
Thanks to Brett S for this description of the intake manifold removal process.
My description as to left or right is as you are looking at the component.
Start by removing the 4 12mm bolts that go to the 4 supports on each corner of the intake, 2 in front and 2 in back, though the one in the back left of the manifold may be much larger, I didn't remove that one. There is one more 12mm bolt to the right of the throttle body that is for support.
Next remove the 12 10mm bolts that bolt the intake runners to the cylinder head, look down in the center of the manifold assemble.
Next remove the 2 12mm nuts and 2 12mm bolts that hold the throttle body on to the manifold.
Next remove the electrical connectors at the DIS module, left side of manifold, at the vacuum solenoid for the secondaries located on the back of the manifold about 4in from the fire wall, and then the throttle position sensor located on the left side of the throttle body.
Now there are 5 or 6 small coolant hoses and vacuum lines that must be disconnected, some of them are self evident, others you will see as you start to lift off the manifold, which you can start to do at this time. Lift more from the left side as you raise it off and pull the throttle body off, disconnect whatever remaining plugs, hoses, nuts or bolts that may have been missed and it shouldn't be a problem.
Reinstallation of the intake manifold is just the reverse and is just as easy.
The only words of caution the I will offer is, be careful not to damage any on the gaskets or mating surfaces and make sure they are clean when you reinstall everything.
The gaskets can be reused without a problem, but if you damage one of them or scratch one of the mating surfaces, sealing of the assemble might be compromised.
Good luck and may the force be with you.