Unit works decent except it slows and speeds up just a little, even on level road. Took servo off and cleaned it, looked fine. Speedometer is rock steady, cleaned and lubed cable anyway, throttle cable from servo is free, can't see any vacuum leaks. I really use this thing.
Any ideas?

Check the cruise control module mounted under the dash on the passenger side. Kind of hard to see unless you are laying on your back looking up with a flashlight. Will be just a little over from the right side of the center console.

Thanks, figured there had to be more to this than the solenoids in the servo. Might have another one to swap out the control if I can find it.