It sounds like the intake manifould gasket is leaking.
This is a very common problem on the 3.4 litre and the 3.1 litre engines.
The factory gasket is made of plastic and tends to crack on the ends near the coolant passages.
For a few extra bucks fel-pro makes a metal replacement gasket.
If you are going to go through the expence of having it changed I would recommend spending the extra money and getting the good gasket.
Hope this helps!
Monday, December 24th, 2007 AT 2:31 PM