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Message: <blockquote data-quote="reivaxtorres" data-source="post: 411603" data-attributes="member: 8890">um.....what hole on the back of the manifold? there should be no hole.........as far as the high idle..........could be due to the fact that the o2 sensors werent plugged in, you had no exhaust on it (the modular engine reacts bad to not having the midpipes on........since the first 2 o2 sensors on it kinda control the a/f delivery), and that all the vacuum lines werent on. any ideas where the whistle is coming from? due to the higher amount of air being pulled in, its not uncommon for the intake to whistle, but then again its also a sign of a possible intake leak, usually around the throttlebody area</blockquote>