Coolant leak

I own a 1997 C1500 Cheyene with the 4.3 l V6 I have approximately 83000 on the original engine. I am noticing a coolant leak and I have checked the engine over good and upon inspection found anti freeze leaking down the left rear side of the engine I can't see where it is originating from could this be the intake gasket leaking, and is this a problem common to this engine?