96 cavalier no power when accelerating

Can somebody please give me some good advice/news? I have a 96 cavalier 2.2 automatic, 129K miles. In the last few months I've noticed that at times I wouldn't have much power when I step on the gas and the engine would rev, but after a few seconds it would be fine and drive normally. This had only been happening when starting again from a stop. And there's been a few times where it has stalled on me when I am just sitting like at a stop light? or a drive thru window? Someone told me it was probably the fuel injectors and to just go buy a bottle of cleaner at and auto store to put in my gas tank. Well I did that, and ever since the problem has gone from bad to worse. Now instead of just occassionally having the acceleration problem, it's constant, I can feel the engine revving all the time, and today I had the gas pedal down to the floor just to get the car up to 60mph. the check engine light hasn't come on, nor any other lights? Do I need to have my injectors cleaned or is this something far worse???

have you tried changing the air and fuel filters? also you said that you hear the engine rev, is the tranny slipping?

My first thought too is tranny slipping........thats how mine was before it went and mines also Automatic, 1997