WARNING: This page is about a different car, the 2002 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Tighten bolts and nuts to 18 to 21 N.m (1.8 to 2.2 kg-m, 13 to 15 ft-lb) in numerical order shown in the figure.
Fig 1: Tightening Torque For Upper Intake Manifold Collector Bolts