I have a 96 3800 series that I bought with a blown head gasket. i replaced both gaskets and all intake gaskets but I keep getting coolant leaking into intake and when I shut car off it comes thru throttle body. I have seen that there are problems with intake and fix kits and tsb on new torque settings but not anything in detail about this. Any help would be great.

 

If it comes through the TB, there probably is a problem with the coolant passages in the TB. You can bypass the TB by splicing the 2 hoses to each other, stop the leak and gain 1/2 hp in the process.

 

on the 3.8, there are no hoses for the coolant. it runs through the intake manifold to the tb. only way to block flow through it is plug up the tb passages or i think some spacers will do it as well.