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I did this on both my 740 and my 240 (both NA or non-turbo)and the process was exactly the same. It was the biggest job I had done up to that time and it looks a lot more complicated than it really is. Just buy a gasket then take your time removing the hoses so you don't break them. It would be difficult to mismatch the hoses afterwards, but label them and their nipples of you want.
The only slightly tricky part is that little plastic clip that holds the ball and socket together from the throttle, but that isn't bad once you have a look at it. Push the tab down and then use a flat screwdriver to gently pry the socket off the ball.
Once you remove the nuts and have the TB off, use throttle cleaner (not carb and choke cleaner because supposedly it removes factory varnish) and a tooth brush to clean it all up. Use Lots of cleaner and do this outside over some cardboard or something. Just try to keep it oriented so none dribbles into the throttle position sensor (the thing on the back of the TB with a wire you will have to disconnect). Pay particular attention to the line where the butterly closes (there will be a line of thicker crud there) and the little passages for the vacuum hoses. Poke those clean if need be.
Then put on your new gasket and reattach it all. The odds of your mechanic messing it up are probably higher than if you do it yourself. When you are done you will understand you car a lot better.
good luck
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Andy in St. Paul, '91 745 Regina 190K mi, '89 244 137K, '87 245 RIP
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