1997 Buick Century car died, no coolant

My car died while I was trying to pull out, and it had said low coolant the other day and I put some in, but had not checked for leaks. When the tow man came he said it was out of coolant. I seemed to have a couple lunging problems with it earlier that day but i'm not sure if it's the same prob or a different one i'd had intermittantly the last yr. When I start it it bucks around kinda crazy and acts like its out of gas and dies or won't go into gear. It seems i'm loosing air somewhere or a hole when its flops. Any ideas?