1999 blazer
 

Really need some help. 4x4 would turn on and off by itself . So I unplugged 4c4 unit then after awhile , the dashboard lights began to flicker on and off , staying on occasionally .gauges stopped working , LCD display for gear selectin stooped working and the car we'll not go into gears once started . Every gear seems to be neutral .tried replacing ECM but same problems still exist