Torque does not determine fuel pressure. It sounds like you have a bad fuel injector. Now which one is bad? What I do is while the engine is idling, I loosen the nut holding line to injector and listen to see if idle rpm's change. If that injector is working, rpm's will drop. what you are doing is shutting off fuel to that particular cylinder. If engine rpm's do not drop, you found your bad one. You must do this for every cylinder. Keep rags handy because when you crack open that line/injector, fuel spurts out on engine. Do this quickly and carefully, and everything will be ok.