Wtf?????

I tend to agree with 74dusterkid. The cruise control gets its input from the rear speed sensor. Its's a magnetic sensor thats on the rear diff. You should have a ABS light come on also because it's also the rear ABS sensor. A lot of times the tip of the magnet gets a lot of metal shavings on it from ring and pinion wear. Sometimes you can pull it out and wipe it off and it will work. Of course while your under there first check for road debris damage to the harness. Hope this helps.