I've got a 99 V8 4 door. Most of my problems are either underbody rust or electrical related. When I got it the door locks didn't work, windows didn't operate correctly among others. Replaced a few switches, cleaned a few more out and most of that works pretty good most of the time. Now what's come up is the passenger side door lock isn't working. Again, I think it just needs to be cleaned/replaced with JY parts. Replacing the switches isn't too difficult and probably only cost a few dollars from the JY.
Another, more annoying, problem I have is that the left turn signal turns on sometimes with out even touching the blinker switch. Jiggle the hazard switch and it goes away. I think I just need to replace the multifunction (blinker) lever/switch and all will be well.
I think the previous owner lived on a dirt road a thousand miles from asphault so lots of dust got into the electrical system.
Mechanically, though, it's pretty good. Very few problems mechanically and it has over 223,000 miles on it.