1992 240 Automatic engine will start out fine. After awhile (10 minutes or so) the car looses power, sputters and will run very rough. Eventually the engine may even itself out. Most of the time it takes stopping the car turning off the engine and letting it sit for awhile. When the car is restarted, giving it very little gas at acceleration seems to help, almost as if it needs to catch up. Repeat process until I eventually reach my destination. Fuel filter replaced. Air filter replaced. Mass Airflow Sensor cleaned (no codes). Spark Plugs and wires recently replaced. Recently ran fuel injector cleaner through it.

Any ideas???