I've heard of GM cars having problems with the intake gaskets going bad and coolant then leaking in there, but never on these. My guess is a really bad blown head gasket. Any coolant in the oil? Oil look milky?
Otherwise you just have a coolant leak somewhere that somehow got into the intake.
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2008 Mercury Sable Premier
2014 Ford Focus Electric
1997 Mercury Grand Marquis GS
1991 BMW 850i E31 M70 V12
Moved On: 2000 Sable LS Premium Duratec