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NOT NECESSARILY!
The intake manifold in these cars are notorious for melting out where the egr tube goes into the upper intake by the throttle body.
IT IS VERY COMMON! pull the throttle body off and look into the upper intake. I bet its soaked with coolant.
if you dont believe me, do an internet search for GM intake manifold leak.. its a problem on the 3.4l and the 3.8 l motors
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