sounds like its about dead to me man, my GZE had one die not to long ago, i replaced it with a 4A-C one ( i think my car goes slower now though, jk). I assume u will be able to use any 4A series? anyone know for certain? As for taking it out, just have a look at it, not sure about the ae92, but my 86 just 2 bolts and it came out. Im sure u wont have to take the engine out.