'95 Grand Am Engine Bogging Down - Help

I have a '95 Grand Am that occasionally when I accelerate from a stop or go from a high speed to a low speed, and then try to accelerate, the engine bogs down and the car loses power. It does not do this above 40mph and has never done it cruising on the highway. It does not matter how long the car has been running, and sometimes it will go for days or a week without doing it, and other times it will do it at every stop. Any ideas on what could be causing this?

- replace O2 sensor
- try another MAF sensor from junk yard

Thanks, Ill give it a try and let you know how things turn out.