I have a 1995 Impreza 1.8 L Automatic that won't start. The starter and the battery have both been tested and are fine. The guy at the auto parts store suggested that it might be the neutral kill switch, but he didn't know exactly where that was located on the car. So, I am in need of information on how to locate it and what tools I will need to replace it. Also, on a side note, are there any tricks on getting the bottom retaining nut of starter to go back on?