1999 Explorer transmission lines?

First thing to do is tofind out what kind of fluid it is. It could be motor oil, coolant, or trans fluid.A quick loss fo fluid like that from the trans shouldn't stop the engine from running, but fuel leak or oil leak would. Or a loss of oil pressure would as well as it would shut off the fuel pump. So do your basics, check for fuel pressure and spark as it may be a coincidence.