At least it's telling us the bank # I guess!
It could even be electrical, I've seen a crimped/damaged injector harness wire cause the injector to intermittently not fire, seemed to happen more once the engine warmed up. If the engine has been monkey'd with (94 engine in a 96? engine swapped?) it wouldn't take much to damage a harness wire just enough to cause it to short/open/fail intermittently.
Of course, I could be totally off as well, but it's a possibility.