2002 Cadillac Deville water on rear spark plugs

2002 CADILLAC DEVILLE
100,000 MILES • 4.9L • V8 • FWD • AUTOMATIC
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PCDJ1964
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this is a weird problem, both sides of the back spark plugs are wet.
if i replace the spark plugs the car runs fine for around a half hour and then starts running like it is on less cylinders and the code shows random multiple misfire.
i changed the spark plug boots and there is no difference, it is not plain water, it has a orange tinge to it.
how would water get on the white part and the tip and cause them to foul out?
Mar 18, 2015 at 1:45 AM
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HMAC300
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a blown head gasket, have coolant system pressure checked for leaks.
Mar 18, 2015 at 7:57 AM