2001 Isuzu Rodeo Stalling a lot

I have a 2001 Isuzu Rodeo that has been stalling for about 6 months now. I have taken my car into shops and they were not able to figure anything out. When the car stalls the check transmission light and cruise control light appears right before the car actually dies. Doing research I kept getting results of the anti-theft system failing. We disarmed it, shortly after it started staling again. A dealership said to remove the anti-theft system as they believed it was faulty as well. It was removed and the car is still staling. Why could this be?