It could be your connection to your battery. If its bumped loose, you would lose all power, even while driving.
Sump compression
the voltage regulator
A dodge pickup 1500 would stall out while driving because of a defective air filter.
vacuum leak
Vapor lock!
if it tends to sputter and have no power i would suggest the fuel pump. it it is only after the car has warmed up, or a while after you start driving it might be the ignition module.
If you lost power while driving and it did not start again, it could be an alternator issue. Double check the battery just to make certain it isn't an issue with the cable connectors too.
because you turned it on. The Kia sportage has an econ button, if you push it the power button lights up.
Sounds like a fuel pump.
The reason your 2001 Hyundai Sonata lost all power while you were driving and stalled and won't start again is either the battery or the alternator. If you have no power you most likely have an alternator problem.
I put quite a bit of mileage on my 2001 Kia Sportage and had to replace the timing belt at 100,000 miles. I have owned the car for 5 years. I was driving on the freeway doing 70 miles an hours when all the power shut down and the car would not start back up although it would crank. Hope that helps you.
The difference in combustion: you shouldn't change while under power: