Cruise control

I have a 99 regal ls with a non supercharged 3.8 and 85000 Miles My problem is that the cruse does not work right it works but you cannot resume and you can not set the speed 1 mile higher at a time. I had a new ac delco turn signal stalk installed but that did no good. Help! Thank You

You could have a wiring issue between the multifunction switch (stalk) and cruise control module at the engine compartment. If the resume signal is there at the module input connector then the cruise control module would most likely be the issue. However, it is difficult to troubleshoot these type problems since the vehicle has to be moving. A GM dealer can run a Tech 2 scan tool on it and see if any cruise related DTCs are set and check the circuits.