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while checking out my car i decided to check vacuum. i tested 17 inches of manifld vac at a couple of ports, but at the port for the vacuum line that goes to the "T" for pcv i am only getting 10 inches. i cleaned both connections out and replaced the line to no avail. can these intakes and throttle bodies get that dirty inside? also how much vacuum should i be getting. i was planning in changing the intake man gasket anyway so now i will probaly spend some time cleaning the intake, T.B., and idle motor.

once again thanks for your time...dan
 

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I looked in my book and can't find any numbers for vaccum.It is possible for the inside of the intake to get dirty.If you want to look for a vaccum leak with it running spray carb cleaner around all connections and gaskets.If the idle changes there is a vaccum leak.
 
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