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I'm fully aware of the exhaust manifold problems on the late 90's 4.0 L ; mine has already been changed once. Now I have a new leak and I CANNOT find it. I have crawled all over and under my '97 4.0 L. I have duct taped my leaf blower to the tail pipe and used soapy water looking for this leak. It's definitely not obvious, but it sounds just like a cracked manifold. Any suggestions on where to look for that nasty slapping sound as you pull up a long hill?
 

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Jack Lives Here!!!
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How about your Catalytic Converter? Could be something loose in there.
 
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