vacuum in the crank case at idle is normal as this is when manifold vacuume is at it highest, I would be more concerned if the was pressure in the crank case at idle indicating a blocked PCV system. Any way as he stated the high vacuum he was experiencing (should be around 15-20Hg) at idle engine size dependant was down to a blocked intake air filter.
At cranking the vacuum should be almost zero with the throttle wide open.
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