Could be the grounding points...

http://www.velosterturbo.org/forum/...rg/forum/veloster-turbo-diy/12639-ground-point-locations-around-engine-bay.html

 

Grounding would be my first check.

This assumes your battery is good. The alternator provides most of your power once the car is started and then shares the load with the battery. While most of the power comes from the alternator the battery helps out under transition loads until the alternator catches up. If the battery is going bad, your regulator is going bad, or the alternator is going bad they will many times have the same symptoms.

Start the car. Once everything stabilizes, while the car is running remove the negative lead of battery. The car should keep running. If it bogs or cuts off you have a bad alternator/regulator. If everything seems good there stop by the dealership and have them test your battery. Hyundai has put out some bad batteries and has had a few campaigns to replace these batteries, even if out of warranty. You can have autozone or advance auto do the same but you won't get a free battery from them.

 

Awesome thanks I will give it a try and let you all know!

 

Check the wires behind your bumper for a headlight wire being rubbed and having a short.

 

You should unbolt all the grounds and sand off the paint behind them and bolt em back up. That may not fix your problem but it helps out your sensors.