My Plastic intake on my 99 grandprix cracked and my cylinders filled with coolant. So if you are loosing coolant that might be where it is going. But i was wondering if anyone new the torque value of the aluminum lower intake?

132 in/lbs

Be sure to follow the proper torque sequence on the LIM bolts. The UIM bolts is 89 in-lbs and requires a proper torqueing sequence too.