My 87 300zx has been sitting for a while with a gas leak well the other night i pulled it off and fixed the problem. but when i finally got it started (battery deader than door nail) i cant go into any gear not first not second not any of them and if i try to put it into reverse it grinds loudly and wont go into reverse either. i tried turning off and starting in first and the car was trying to lunge forward in first like it was gonna drive off with the clutch to the floor.