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Re: 02 knocking
It sounds like you could have a bad LIM gasket.
They knocking is most likely the typical 3.4 lifter sound - our pnuematic lifters take a while to get the oil up to em when you first start up.
The anti-freeze leak is most likely an external LIM leak. Your oil would not be milky if it was an external leak. Check the area underneath your throttle body. This is a typical area to have an external leak.
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