97 grand am no power

hi im new to the forum i have a 97 grandam se with 2.4l. and an auto tranny. the problem is i was driving on the highway and when i went to accelerate there was a complete lack of power. i put the pedel to the floor and the car couldnt even hit the red line.. the car runs fine at and idle but when i try to get any power i can hear it sucking all kinds of air but theres no power. i replaced the coilpacks and plugs two weeks ago and the throttle position sensor and the o2 sensor today and its still doing it...any ideas???