I have a '91' Z28, with a 5.7 L98 with a 700r4 , the promblem I'm having is somtimes my car feels like something is holding me back, like the car just doesn't want to go
it seems to rev up up fine when in nutral but not in gear, any suggestions

Okay obviously the emergency brake is off.
Have you done a rear brake job recently? If not Have you ever changed trans fluid/filter?