Civic - Honda :: Engine Would Rev When Gas Pedal Pressed But Car Would Not Go

I have replaced the computer in a Honda Civic twice. The first time the car was acting like it wasn't getting power;the engine would rev when the gas pedal was pressed but the car would not go! so the computer was replaced, and two weeks later,t he same thing happened. They said it was a short and would not replace the computer-it was our problem. Finally, they agreed to replace the part. Got the car back, fixed a ouple of othere things and now, two weeks later, the same thing is happening. Car acts like it's not getting any power, and this time the check iengine light came on. The car has a new altenator, new battery, and the after-factory radio has been removed..