Quote Originally Posted by k3tsurui View Post
it is probably a bad ground at the injector (unlikely the ecu) check physical condition of injector wires where you can....if you cant find anything wrong then take the ground from cylinder 1 and 4 and tied them together, likewise with 2 and 3..........not really a handbook fix but will do the trick
The ecu grounds each injector to make it open so that would probably not be a good idea. If it is one cyl with the issue do what QWK D16 said and swap the injector to see if the prob moves with it. It could be a bad injector mechanically stuck open. Just be careful, you dont want to hydrolock your engine if it is straight dumping fuel continuously.