I have a 96 Maxima. It has 153000 miles on it.I came home after driving it Saturday and when I went back outside, it would not start. I checked the battery cable end, and it was tight. I replaced the cable ends. I get power to everything, but the car says nothing. After about an hour, the car starts. But right before that I switched the anti-theft start relay. Later that night, it does the same thing. Taking the relay out and placing it back in did not work this time. The next morning the car starts. I started it a couple of times and all of a sudden it wouldn't start again. Any suggestions?