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Thanks for posting
It's more likely to be a fuel injector than a blown head gasket, the V6 engines up to 1995 did have head gasket problems but this engine has not have chronic gaste problems but of course nothing can be ruled out,
Signs of coolant leaking into the combustion chamber are:
Loss of coolant in the reservoir bottle
engine running hotter than normal
white or gray exhaust emission especially at cold start
Does it have any of these symptoms?
The head gaskets can also be tested using a simple chemical test that detects hydrocarbons in the cooling system or by using an emission tester, both can be done at most repair shops, so if you are in doubt about the headgasket have it tested. The #6 uel injector is fairly easy to get to o you may consider just trying it first.
Please let me know if you have any other questions about this.