1995 oldsmobile delta 88

Why won’t the car idle when its cold. Tried replacing coolent temp sensor, MAS, ho2 sensor, idle air control sensor, intake air sensor, gm computer, throdel sensor, fuel filter, and still won’t idle. Do you have any suggestions what it could be? Could it possibly be cam/crank sensor. The computer reads error on the can/crank sensor. Put a new ho2 sensor in but computer still reads bad sensor.