Vortec 5.3 intake manifold mystery

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MarkHB

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Upon changing the engine in my 06 Tahoe, I had a question as to an item on the back of the intake manifold. It's a little button looking thing with a red collar, it will move slight aft and then back.
What is it?
The salvage engine I have does not have one installed.
How do I remove?
 

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