Cruise control question

[Reed]

I have a 08 venture. the cruise workes but when going down hill then an the way up it will lose about 5 mph then pick it back up to set speed. Would the cables be out of adj? I did adj the carb floats so it is possable I didn't get the cables just right!

Thanks for input!

 

Ps. the floats were way off from the book. Milage went fron 34 to 42. Don't put that in stone. I need to do some more checking on that part.