Sometimes the routing of the cable gets "moved" over the years, PO's and rework down below. If the cable was too close to the exhaust, it can melt through the cable over time. Mine was starting to do this and we moved it. My problem (why we looked) was it was bouncing (+/-5MPH) until it climbed over 30 MPH and then its steady. Did you have any indications like this before it failed?