Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
There has been a service bulletin for that type of concern. Here is what it states.
Bulletin No.: 03-06-01-010C
Date: April 08, 2008
with 3.1L or 3.4L V-6 Engine (VINs J, E - RPOs LG8, LA1)
This bulletin is being revised to update the Parts Information and add an Important statement. Please discard Corporate Bulletin Number 03-06-01-010B (Section 06 - Engine).
Some owners may comment on an apparent oil or coolant leak. Additionally the comments may range from spots on the driveway to having to add fluids.
Lower Intake manifold may be leaking allowing coolant oil or both to leak from the engine.
Install a new design lower intake manifold gasket. The material used in the gasket has been changed in order to improve the sealing qualities of the gasket. When replacing the gasket the lower intake manifold bolts must also be replaced and torqued in sequence to a specification.
Important: The gasket kit part number listed below now includes the new bolts (4 long bolts and 4 short bolts) with the pre-applied threadlocker on them. It is no longer necessary to order the bolts separately when ordering gaskets.
Notice: An oil leak may result if the vertical bolts are not tightened before the diagonal bolts.
Diagonal bolts may require a crows foot to tighten.