Hey everyone, I have a '91 AWD 4EAT Legacy wagon that's making me crazy! long story short, it's got a miss/rough idle that I tried a few fixes for(checking/cleaning grounds, tune-up, switched coilpacks) all to no avail. I finally tried disconnecting the injectors and found that injector #4 was the only one not causing a stumble when disconnected. Figuring that I had identified the problem, I replaced the injector with a spare that I had kicking around the shop. Upon starting the car with the new injector everything seemed fixed and my rough idle was gone! unfortunately, after driving it for a day, my rough idle returned, and again it seems to be the #4 injector. Even after pulling the manifold and replacing the wiring harness, that injector doesn't seem to be working. Is the computer the only remaining culprit? Any insight would be greatly appreciated!