Kia Troubleshooting Questions? Ask a Mechanic
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In some cases this can be caused by carbon build up in the throttle body bore itself as it can block the air flow from entering the throttle into the intake when warm.Usually this can be repaired by using a shop rag with some carburetor cleaner or brake cleaner sprayed on the rag to wipe clean the throttle body bore and bore plate.This is the most common cause here.
The other issue is a weak fuel pump as the check valve in the pump can fail and cause low pressure on restart when hot causing this.If cleaning the throttle body does not correct this here I would have the fuel system tested for any issues needing replaced like a failing fuel pump.
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