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What did the spark plugs look like. If water is getting into a cylinder, that spark plug will be clean, and look different than the rest of the plugs.
 

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These engines are know for intake manifold water leaks. I had to do mine several years ago. And since this is a job you dont want to repete any time soon, I used FelPro gaskets, and would say, dont buy the cheap gaskets.
 
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