Cadillac Repair: CAR DIES WHEN DRIVING, nosies, fuses

Question
MY CAR SOMETIMES JUST TURNS OFF, EVEN WHEN IM GOING 70 ON THE FREEWAY, ITLL JUST COMPLETLY SHUT OFF AND I WOULD HAVE TO PULL HELLA HARD CUZ THE WHEEL WOULD LOK AND TRY TO COAST TO THE SIDE OF THE FREEWAY.  

Answer
What model/year? First check the connections at the battery, the battery itself, and then the fuses, let me know if they are corroded or loose or burnt up. What components are on when the car shuts off? And how does the car run otherwise are there any strange nosies when the radio is on and you accelerate? And what major work has been performed on it?
Next run the diagnostics by pressing off and warmer simultaneously on the ac panel. What codes come up?