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Re: 3.8 GM intake manifold replacement/instructions
Since you have a '99 and up the UIM plenum gasket is possible. The lower years ('98 and under) suffer from EGR stovepipe meltdown causing the coolant consumption which requires replacing the UIM plenum. We recommend that the LIM gaskets are replaced since they are an issue and could be the cause of the internal leaking. To start it is best to remove the UIM and perform an inspection.
Just send me a PM message with your regular email address and I'll send you a PDF file that covers it in general.
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