Cruise Control

I have a '93 G20 conversion van that the cruise control works intermittently. It seems to work fine for about the first hour after starting the vehicle cold. After that it starts to not hold speed well or resume or reset. I have replaced the VSS and that helped it work better and longer but still not fixed. I have an article on how to check the DRAC module on my home computer, unfortunately I am about 1,000 miles from home on vacation, if anyone has any ideas or access to that article I would appreciate it. I do have access to parts from where I'm at and would dearly like to get this fixed before the drive back.