i have a 96 civic hatch automatic i bought it with a bad motor i replace the motor and went to start it and it like spins half a turn than stops and doesnt keep trying than when u stop trying to start it u can hear like a loud air leak like something is pressurized and leaking need help....thanks

 

Is the "air leaking sound" coming from the intake manifold,[listen at T/B] or from the exhaust manifold, listen at muffler outlet????

Sounds like a valve is not seating properly, cylinder(s) on compression stroke has valve that is leaking, [not seated], intake valve if sound is from intake manifold, exhaust valve if sound is from muffler.

A compression and leak down check should be done, have you checked valve clearance?
How is the mechanical timing, the GSR engine is an interference engine, can engine be rotated past half a turn by hand, are valves running into pistons, a bent valve will not seat properly, insure cam/valve timing is correct.94