Basically you remove the throttle body, fuel rail, and anything else that is plugging into it, then unbolt it. You need to get a shop manual however, because there is a specific bolt pattern you need to use to avoid damage.
You have to remove the intake manifold to access the plugs in the back.
remove intake manifold.
Beautiful site here: http://home.pacbell.net/fong8/gstuff/tjc_plenum.htm
intake ports are differnt non-turbo only one vac port for the fuel reg.
on the intake manifold
There is 2 of them. and they are under the intake manifold. You will have to remove the intake manifold to get to them.
on the intake manifold
Remove the intake manifold retaining bolts from your 1993 Mercedes-Benz manifold. Remove the old manifold gasket. Clean the surface and put the new gasket on.
Remove the intake manifold, exhaust manifold, and then remove the head.
Remove the intake manifold retaining bolts from your 1996 Chevy Astro Van. Remove the manifold gasket and clean the surface. Reverse the process to install the new intake manifold gasket.
OBX
On top of the trans underneath the intake manifold.