Stop in for a cup of coffee

Those 3800’s had an issue. Plastic intake. Egr and coolant run through it and pass in ports that are very close. Have seen 4 or 5 that blow through.
Pumps coolant into intake. Literally pumps it. Imagine coolant seeping enough to stall a hot engine, immediately after the stall heat soak kicks in and floods it even more.
There was a repair,a steel sleeve that you bond into the port. Last time i made one in the lathe.
That or a new intake.

The wiring around the fuel rail and by the coil pack/ign control gets brittle too. Something to look for if you lose spark or fuel injectors.