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I have a 2003 cadillac deville with 169,000 miles. I have a misfire with a p0300 code. While checking for intake manifold leaks, i poured water around where the intake seals against the cylinder head. I noticed that a bunch of white smoke began to come out of the tailpipe which has never happened before. Does this mean i need to replace the intake manifold gaskets? I am aware of this car being prone to head gasket failure. However, i do not have the symptoms of that. No overheating and no oil/coolant mix. Just a rough idle and rough acceleration with no power.
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