Hyundai i30 2011: Why is my car stalling?

This sounds awfully like a sensor problem of some sort. Electronic sensors really do control every aspect of a modern car, from the engine to the dashboard and everything in between. So, it’s conceivable that your problem is the fault of a single sensor that is throwing multiple things out of kilter and causing the problems.

But why the engine and dashboard at the same time? Because a car’s computer will often take its cues from a variety of sources. Without a properly functioning dashboard (and the information on road-speed the speedometer supplies to the computer) some engines won’t even run at all. The rough running and hard starting could be another symptom of this.

But don’t rule out something simple like a battery or charging system that is not pulling its weight. Low battery voltage can do strange and random things to a modern, electronically-controlled car.