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easy way to check intake leak - with engine running spray brake clean around intake gaskets - idle will race if a leak is present - your first pass may of caused a leak..just a thought good luck - also I'm not sure about your car but some cars use vacuum for heating vents under dash - it will be hard to hear a leak - sorry don't know the part #
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I had the same problem ran great the first couple pulls then high idle. Check your torque spec on your intake.
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We've gone back to nothing but OEM Ford intake gaskets on mod motors after sealing issues with aftermarket.