2000 Ford Contour, SE Automatic. It is not the timing belt, nor the fuel pump. We have checked fuel shut off button (I was rear ended on Nov 1). One thing the mechanic did say is that one of the cylinders (4 cyl)is "firing" below 100. Looking for some help here. I am going to have him call the mercury dealer today about the transponder. Could this have anything to do with a fuse?