'98 5.7L Vortec I've only had for a few months. Noticed that it was using a little coolant. "Borrowed" Autozone's pressure tester and hooked it up last night, and I've found the leak. It's a small leak, and it was kind of hard to see. The leak is located underneath the thermostat housing/upper radiator hose outlet. Like I said, it's kind of hard to see in there, but I could see the puddle down in there, and I couldn't see anything coming from the thermostat gasket or the coolant sensor. Is this the notorious intake manifold gasket leaking on me?