Water leak even not under pressure. looks like it is coming from under front driver side intake gasket??? 4.3 liter... Is it the gasket or a warpped intake? i'm not sure if it is worth the fix.
The lower intake manifold gasket will be the problem. This is a high failure rate item and GM has redesigned the gasket a couple times in an attempt to correct it. Currenty Napa has the best replacement gasket and it is known as a "Perma-Dry".
I have done many and have never seen a warped intake. It's worth the fix, take your time and torque the gasket as per the instructions provided.
Good luck
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