Ok I just had my drivers side head replaced at the Ford dealership. When I got it home I noticed a short lead that comes off the injector and coil cap harness laying loose. It is black, about six/seven inches long and has a small female, right angle connector on the end of it. Does anyone no what I am talking about and where it goes? I have gotten a flashing check engine light a couple of times. It has only happened while AC was on and went off when I turned AC off. The car seems to be running fine and not missing. Help appreciated.