Cadillac Repair: 1992 CADILLAC DEVILLE RUNS ROUGH, combustion chambers, oxygen sensors

Question
IJUST PURSCHASED 1992 SEDAN DEVILLE 69,000 MILES.BEAUTIFULL CARS RUNS GREAT AFTER ABOUT 10 MINUTES.HOWEVER THE FIRST 10 MINUTES IN THE MORNING THE CARS RUNS ROUGH,STALLS OCCASIONALLY.AFTER IT SITS FOR SEVERAL HOURS ,SAME THING RUNS ROUGH FOR ABOUT TEN MINUTES. I HAVE REPLACED MAP SENSOR,DISTRIBUTOR CAP,PLUGS WIRES .  NO LUCK I NEED YOUR HELP.

Answer
IS or HAS the CHECK ENGINE light on the dash ever illuminated while driving the vehicle ?.

If it HAS, We need to access the computer for fault CODES.

If it has NOT, Most likely cause is leaking fuel injectors dripping fuel into the combustion chambers overnight and it takes awhile for the engine to burn off this fuel in the combustion chambers which causes the oxygen sensors to make the car run LEAN on fuel until the oxygen sensors sense no more excessive fuel in the exhaust.