Recently rebuild the motor in my 89 hatch. All I did was freshen it up and put some gt40p heads on. Now I have no power at all. And it revs so slow. It's also sounds a little like a tractor when you first start revving. It's almost skipping but it's not. It's like a cylinder isn't firing but yet at idle the sound is good. It also is randomly after firing. It can be idling fine and all of a sudden pop then back to normal.