my 88 crx did the same thing i went in where the cable hooks to the transmission and cleaned it of with a wire brush and then pulled it through make sure that you dont pull it all the way out, only a few inch's and then just put it back in and then go to the back of where the gauges are and make sure it is all the way in. sometimes the clip breaks and it comes loose every so often. but i doubt that it is the the actual cable. if it is that those tend to be a little pricey for just a cable. hope that helps!!