We have a 1998 3800 automatic naturally aspirated that lurches/chugs only when at 2000RPM or lower at steady throttle when under a load (i.e. any hill). I've replaced the Throttle Position Sensor, fuel filter, plugs, PCV, air filter but to no avail. Can this be a MAFS? If so, where can I find a thread to replace it? If not, any ideas??

Help!

Thanks!