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I have a 99 Cadillac Deville.  For about 1 & 1/2 years the service engine soon light has come on and gone off periodically.  However, now each time I drive the car it hesitates and the service engine soon light comes on.  I had it at the Cadillac dealership, it coded for Mass Air Flow Sensor defect and they replaced it.  Well, it is still doing it.  I drove it home Thursday from the dealership and it hesitated, Friday it hesitated.  Any ideas?  I am taking it back to the dealership Monday, but has anyone had this problem from their 99 cadillace deville?  

GM has had problems with the mass airflow sensors for years they even tried blaming it on the oil from like K&N filters causing them to fail.