Ok, I have a 99 GT, top swapped. There is a sensor unplugged on the rear of the engine, VERY hard to get to to plug it back in, the sensor is in the block, plug in is facing the firewall, the plug is a oval shaped green plug, sensor location itself is passenger side, bottom of block, under the manifold toward the passenger side slightly from the center of the block. Does anyone know what this sensor is? Car wont start and wondering if maybe it needs this sensor plugged in to start. Tried to plug it in, but the sensor has so much grease and crap caked into it it wont plug in..its freezing outside, so if its something I dont need to mess with, then I wont, I am only starting the car to move it a couple blocks.