Sputters only when cruise cotrol is on

If your cruise control cuts off when going up a hill and will not immediately reset, there could be a few different issues causing the problem. Here are a few things you can try to troubleshoot the issue:

1. Check the brake switch: The brake switch is responsible for deactivating the cruise control when the brakes are applied. If the brake switch is faulty or misaligned, it can cause the cruise control to cut off when going up a hill. You can check the brake switch by inspecting it for any visible damage or looseness and making sure it is properly connected to the brake pedal.
2. Check the accelerator pedal position sensor: The accelerator pedal position sensor tells the cruise control system how much acceleration is being applied. If the sensor is faulty or out of alignment, it can cause the cruise control to cut off when going up a hill. You can check the accelerator pedal position sensor by inspecting it for any visible damage or looseness and making sure it is properly connected to the accelerator pedal.
3. Check the cruise control system: If the cruise control system itself is malfunctioning, it can cause the cruise control to cut off when going up a hill. You can try resetting the cruise control system by turning the ignition off and then back on again, or you can try resetting the system according to the manufacturer's instructions.
4. Check for any other visible issues: Inspect the vehicle and its components for any visible issues that may be causing the cruise control to cut off when going up a hill. This can include debris or foreign objects that may have gotten stuck in the vehicle, or damage to the vehicle or its components.
   If you have tried these troubleshooting steps and the problem persists, it may be necessary to have the vehicle and its components inspected and diagnosed by a professional mechanic. They will be able to identify the cause of the problem and determine the necessary repairs.
   In addition to the above troubleshooting steps, it is important to check for any diagnostic codes that may have been stored in the vehicle's computer system. These codes can help to pinpoint the root cause of the problem and assist with the diagnosis and repair process.
   To accurately diagnose the problem and determine the necessary repairs, it is important to have the vehicle and its components thoroughly inspected by a professional mechanic. They will be able to identify the cause of the issue and provide a repair plan to get your cruise control system functioning properly again.

if it just started to happen you may have lost a magnet off the drive shaft. If it is a front wheel drive then you would have two magnets on the flywheel if you lost one magnet it would cause problems.
The other possible cause if the sensitivity setting is set too sensitive then the cruise control will surge .
Setting it lower will allow it to slowly respond to speed changes but if going up hill it will take a while to increase the acceleration . Or going down hill it could accelerate too much before the cruise control realises it is going downhill
Also a very wet road can cause the wheels to spin and cause the cruise control to lose the plot and accelerate to dangerous speeds.
I have had this happen to myself once so be wary of cruise control use in wet conditions.

It may be a coil failing. Check related wiring harnesses for the ignition system. Look for damaged wires and loose or corroded connections. Without proper test equipment it will be harder to identify. You can try removing and inspecting the spark plugs. With some luck you might notice one that is black or wet (at the electrode). Honestly it would be a good idea to have the codes read. If you go to Autozone, they will read them for free but the engine has to be on at the time that they read it. If turning off the ignition, turns off the engine light. You must leave the engine running during the test. If you have any other information or questions, please write back. Good luck.

Need a little bit more info,but Im 95% sure that the whole wiper cotrol module needs to be replace because the circuit is short to B+. (dealer Part)

Since this should still be under factory warranty I would check with the dealer first. Could need to have the computer re-programmed.

First I'll assume you haven't read the owners Manuel, Cruise control is not perfect on any vehicle. if coming to a hill put foot on gas to help rpm, going down hill put foot on brake to keep same speed, cruise control operates off of engine vacuum. Speed sensors can be affected by putting on smaller or bigger tires than what is on drivers door.

My experience is that cruise control works on level roads, uphill you have to control speed yourself same for downhill. Exception is very powerful cars. Did it maintain speeds before? (uphill + downhill)

Firstly check for any air leaks or split pipes under the hood you can normaly hear them sucking. Air leaks can make the car run lean but usually will also make the car run rough or nealy stall when going from cruise to idle.
Sounds like it might be bad oxygen sensor(s) they are used to sense the fuel mixture if they go bad the car can run lean or ritch. This can be confirmed by taking it to a mechanic and reading off the ecu codes (or you could invest in a device for doing this). That will confirm before investing in new sensors.
Hope this helps

You sould have recieved a "recall" notice in the mail about the cruise control for fire and failure issues. they are adding a fusable link where the cruise control harness connects to the brake master cylinder. if you have not had the recall performed yet you should SERIOUSLY consider getting it done, mainly so it doesnt catch fire, but "could" be the result of the failure you've been experiancing! btw, almost ALL Ford vehicles have been affected with the cruise control recall. hope this helps!

All Toyota auto trans cars downshift when descending a hill when you tap the brake. This is called "Downhill Shift Logic"; what this is for is to eliminate the double shift when you come to the bottom of a hill and then accelerate. Normal condition. Usually happens above 38 MPH.
Also: The cruise will accelerate when going uphill. Normal condition.Plus: The cruise will not disengage back to the set MPH after you top the hill. Toyota recommends to disengage the cruise when encountering steep terrain.