I have a 99 SE Contour AT with 72k miles on it. SOMETIMES when driving there is a loss of power to the wheels and a slow reving engine. And other times it seems like it takes the tranny longer than normal to shift. Also SOMETIMES when driving there is a weird knocking noise when the gas pedal is pressed. It sounds like it might be coming from the driver side front wheel or the transmission. Im guessing a transaxle problem or an electrical problem. Can anyone help?