gtp hesitates

i was driving my gtp and got on the throttle about 3/4 while it was boosting it felt like something gave out... now when i drive normal with light throttle its fine but when i try press it so the car will pull and or build boost through the charger it makes a fluttering sound and hesitates to go ive heard of couplers going bad and causing a similar but ive heard it does this noise at idle also my car does not it just hesitates and has this fluttering kind of bogging sound if anyone has had this problem or knows what might be the problem i would greatly appreciate i think its either the coupler,a tranny issue or some kind of seal in the supercharger no check engine lights are on or anything but it did just start happening so it could come on soon thanx MIKE