In Reply to: Intake manifold gaskets and idle problems posted by Rob Baum on December 22, 1999 at 12:26:32:
I did this repair on my '88 750I. Consider 6 hours work. First remove the cover of the engine. Then remove the complete fuel injection under the cover. Then you need to loose the screws of the intake manifold. Each manifold pipe has two screws, one is visible and pretty easy to loose, but the other one is under the pipe and vey tricky to access. BMW told me that they use a magnetic wrench (or similar) so the screw will not fall into the engine. I put some chewing gum into my wrench instead). After loosen all 24 screws you can take away the manifold. Change the gaskets (about 300$ as spare parts). Then do all the steps vice versa. Good luck .
I even took a video of this repair...