I just replaced the motor in my car and have run into some electrical issues. It started out with my tach fluctuating and my drivers side cooling fan coming on when the ignition is turned on. Then after a few days of trying to fix it, my fuel pump and injectors started running for about 10 seconds after the ignition was turned off. It flooded my engine, fouled my plugs and turned my oil thinner than water. Any ideas on what could have gone wrong?