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With the intake manifold out of the way, it is a piece of cake. The black box separator below cyl #1 should be replaced along with the large tube going to the top of the cam cover. Make sure the holes through the block behind the box are clean and not clogged with crud. 93's are a little different.
The flame trap screen needs to be tossed. The small vacuum line either gets cleaned out with gasoline/kerosene or preferably replaced.
You probably have an EGR system. Now is the time to clean that mess also.
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My name is Klaus and I am a V♂lv♂holic
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