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Re: that plastic intake is suspect
The 3800 series engines are known to leak coolant internally at the area where the egr tube goes into the plastic plenum.
A pressure test would have showed a loss of pressure (even though you would not have seen any coolant loss)
Also look at the area under the throttle body where the upper and lower intakes meet..you may see some dry white trails where some coolant has leaked out.
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