See also:

Low speed automatic cancellation
ACC is not functional at vehicle speeds below 16 mph (26 km/h). Once the vehicle speed drops below 16 mph (26 km/h), an audible alarm will sound and the automatic braking will be released. ...

Lincoln MKZ Dynamic Driving Technologies
The new MKZ offers Lincoln Drive Control as standard. Lincoln Drive Control is an automatic system that delivers an ideal balance of a smooth ride with confident handling as it intuitively respond ...

Fuel quality
If you are experiencing starting, rough idle or hesitation driveability problems during a cold start, try a different brand of unleaded gasoline. If the problems persist, see your authorized deal ...