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Admin and Sup Mod keeping the peace
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The IACV assembly, might need cleaning. There could be a lot of powdered carbon in it which would prevent the AAC valve from moving freely.
 

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Admin and Sup Mod keeping the peace
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8,373 Posts
There may be a major vacuum leak in the intake system. Check the intake manifold nuts to make sure they are tight. Also check the intake plenum bellows at the throttle valve and at the MAF for cracks or loose clamps.
 
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