need help!!!

i have a 2000gt , long story short. went to start it ,would not start acted like starter was jammed or something? battery was fine also, got a push start fired right up!!!battery light was fine!! got about mile down the road car started to break up all my needle gauges went up an down, an all my warning lights came on, an the screen on my raido(stock) read error!!! coasted to the side of road car went dead?? can anyone shed some light please???

Sounds like a possible bad ground.