Chevrolet: 91 cavalier Z24, cavalier z24, comput

Question
i was driving my car last night it was running fine then i shut it off and it wouldnt start anymore it sounde like it wasnt getting fire or off timing it was turning over fine. then ichecked the fuses and the RDO fuse was blown so i put anew one in and that blew too when i tried to plug it in, so ichecked the rest of the fuses and the RDO2 fuse was gone too, so i replaced both and they blew too as soon as i tried to start it. what are the RDO fuses for.
thanks

Answer
Rob;
  The RDO  is for the engine tuneing data it tells the engine how to run for the best performance ,it tunes the motor in a way , you should have a OBD hooked up to the comput. and see what codes it puts out, it will tell you what is wrong  OK !