64 Plymouth Valiant Dies

As the title reads, Its a 64 Valiant /6, push button auto. sometime at an idle the car just dies. like someone pulled the negative cable off the battery, but the electronics still work. 9x out of 10 it will fire right back up. Also, the instrument cluster lights dont come on when i first turn on the lights. It takes them a while, but they eventually come back on. Any ideas as to what the problem is?