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Make sure to put throttle body gasket back, new or old is your choice. It's not very visible, but I used the old gasket and it is seated on the bolts on the throttle body side as I put the throttle body back in place. The throttle body gasket had mated well with the metal side on the throttle body itself when removed. If you have the same case and are not planning on putting a new one, don't tamper and loosen it off. You have a higher chance of no vacuum leak, if you leave it in its original seated place.
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