Where is my 1996 Isuzu Rodeo 3.2L leaking antifreeze?

Firstly I started smelling like the antifreeze was burning, then I check the radiator and found no coolant. I refill it and drove it and found no coolant again. I refill it again decided to drive it to work and I saw the coolant leaking from underneath by the side of the transmission where it it is bolted to the engine on the driver side. It was running down from somewhere. I can't see where it originates. I took off the Intake Manifold and both Valve covers and still can't it. It's not leaking inside from the Heater Core. Any suggestion please?