a couple of weeks ago i started to get a horrible burning smell coming in the car when the heater was on, so today i took the engine cover off and found a load of black stuff around the first injector and it was hissing, i cleaned the black stuff off to have a look at it and it started hissing louder, now the auto box is stuck in one gear and wont change gear, has it gone into limp mode because of the injector?