there are 5 vaccum connections on your upper intake. 1-vacum to your fuel canister. 2-vaccum to your fuel pressure regulator. 3-pcv vaccum. 4-brake boost vaccum. 5-vaccum to a sensor for the computer to read. Usually the 2 largest vaccum lines are for the PCV valve and the Brake Boost, I hope this helps you (GOOD LUCK).
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