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Q: Map Sensor Code on 2004 Chevrolet S10

I get a Map sensor code and i think it is from a vacuum line that goes into the valve cover on the passenger side. That rubber insert is a little loose. What is that part called?
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It is called the PCV grommett, but are you sure that is the problem? Are there any other vacuum leaks? And, GM Map Sensors do fail.
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