using arduino to control ECU

i'm new to arduino and i want use arduino to turn off IC engine on a wireless signal. so can anyone help me on how to start??? also can you tell if i'll need an add-on to get through this???

What sort of IC engine?

How is the engine normally turned off?

What sort of wireless?

...R

If it’s a car or motorbike , prob not a good idea - engine cuts unexpectedly sort of problem

In short, why? :astonished: