from the book
Install the intake manifold mounting nuts and tighten, in 2-3 steps, to 14-19 ft. lbs. (19-25 Nm) on 2.2L engine or 11-14 ft. lbs. (15-19 Nm) on 2.6L engine. Tighten the nuts at the center of the manifold first and work towards the ends.
have fun