That depends on the engine size.
If the 3.4L v6, it OS on the drivers side top of the front valve cover.
If the 3.8L (3800) it is located under the MAP sensor on the top of the passenger side of the engine.
put a new PCV valve in if it's bad.
Left Side of the engine: in the sensor case attached to the vacuum hoses
chevy impala
it shoulb be replaced about every 35,000 miles but some might be rivited into the value cover
No tools required pull valve from valve cover, pull valve from vacuum line, install new valve.
Servicing required.....
where is the PCV valve located on a 2004 chevy tahoe
the map sensor is located behind the alternator by the plenum, above the the pcv valve
No they won't
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