95 chevy cavalier quad driver codes (i need help)

Hi, I own a 95 Cavalier, 2.2L, auto, Scanned,and System don't Pass, it show me the error code 28, Car runs for a while and the engine stops, I have not idea why is doing this and the scanner printout it shows:
quad driver 1 OK
quad driver 2 bad
quad driver 3 bad
quad driver 4 OK

what can I do to fix this problem????? need help