It could be that your EGR valve has failed or has a piece of carbon stuck in it .
Clean EGR valve, maybe stuck open with carbon
Sometimes a piece of carbon will get caught in the EGR Valve. If is is hard starting, idles rough, and the brakes are hard, check the EGR Valve, it probably has a piece of carbon stuck, keeping it open.
It is just stuck,
Carbon build up. Sticky or stuck EGR valve. Vacuum supply line damaged/leaking. Faulty EGR valve. Faulty EGR Position sensor/wiring.
The valve has failed.The valve has failed.
A stuck lifter, a stuck rocker, a stuck valve, a messed-up cam drive timing and a valve impacting the piston head....
an EGR valve gasket is available that has a screen to block the carbon. They cost $5.69 at the autoparts store in my city.
stuck valve in valve body? solenoid valve faulty if it has one?
you cant, it has to be removed. it is very simple though, onlt 2 bolts and a connector. it is right in the front of the engine and it probably has a pebble of carbon stuck in it.
common problem with all hyundais and kias its a stuck open purge valve. when refueling fuel vapors travel past the stuck open valve and flood the intake with fuel vapors giving hard start condition.
When you shake the PCV valve it should rattle. If it does not rattle then it is probably stuck and should be replaced.