It's probably got a burnt out clutch pack
Sounds like a bad clutch or pressure plate
I have a 95 Lumina 3.1 and it would cut out of gear when I would stop, it turned out to be the sprag gear in the transmission. $$$$
It means... it would suck to be you.
transmission problem
After you engage a gear and let out the clutch and accelerate the car wont move faster but the RPM's will move up. Also in some rare instances when a clutch disk material separates from the disk its self you wont be able to start the car or even change gears.
transmission goes into gear but wont hardly move
rear end is no good
You need to lift your left foot off of the clutch pedal.
it culd be that u have problems with the hand break calbe, or the diferential
there are many causes for this. You should consult a ASE trained technician.
slipping clutch? get a new one
I'd start with the parking brake I have had cars that would back up but not go fwd when it was on. Stuck maybe? Good luck. David