1994 Chevy Silverado leaks from bottom of engine

My 1994 Silverado 1500 has been running rough, chugging, smelling gassy and sometimes quitting while idling. We replaced the plugs and wires. This didn’t actually help, but while testing it, it started to overheat. We added water and the water squirts out everywhere from the bottom of the engine. So there are 2 problems - can anyone help with either one? Thank you.

The first thing to do is Io get the car up in the air to see where the coolant is coming from. The oil pan is at the bottom of the engine and I can assure you it isn’t coming from there.