lately my car feels like it's slipping, it doesnt pull at all. i try to WOT and see if the rpms would act funny but they dont. my rpms does not shoot up or down. I had the AC on the other day and gave it some gas and the car would pull normal, it would pull harder with the AC on, i turned the AC off and gave it a try and it wouldnt pull as hard, it basically feels like the clutch is slipping with the AC off but when it's on it pulls regular. is something wrong with the car? i dont think it's the clutch but i might be wrong.