I have a leak in my trunk of my 98 neon sport too. I thought it would be the taillights not being sealed good enough. But now i know for sure and know it is a simple caulking fix, so thank you very much.
the only other problem i have had with my neon is the stupid sun roof. never has worked properly. the drivers side moves faster than the other side. the motor slips i think or some gearing is messed up. what could it be?