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Probably not. But a failed one will have an effect on the air pressure in the intake manifold and this could cause problems with high idle. Take the pipe off the intake manifold and blow down the pipe. It should be blocked. Take the pipe off the engine and blow down it and air should pass freely. Make sure the pipes are not split or leaking at the joints.

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Q: Will a clogged PCV valve cause the engine to idle high?
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