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P0300 is random multiple cylinder misfire and P0316 is misfires detected on start up. This is an ignition related issue. I would check the ignition system and tune up condition and proceed from there also if you have access to a sanner with live data capability check that you have and RPM reading when cranking the engine and the times it deosnt want to start this would indicate an issue with the crank sensor
P0316 can come on intermittently showing a crank/misfire detection in the engine system. Over time you will notice this fault get worse, especially in wet/damp weather. The fault is usually cause by water ingress into the coil areas above the spark plugs. You need to take the coils out, smear some vasaline ( or similar substance) around the rubber seals on the coil units and refit them, ensuring there is no water in/around the spark plug. If so blow the water out and dry this area.
Hope this helps...vote for me.
Sounds like you may have an issue with the check valve on your in tank fuel pump. When these go bad, you have to crank several time to build up enough pressure in the fuel rail for engine start. With a good check valve, the fuel pressure will not bleed off and the pressure is retained for the next engine start.
I'm not real familiar with the Kia but it will either be located at the front of the engine behind the fan pulley where the crank is located, or it will be at the back of the engine in reference to the crank. This does go out quit often and if yours is located at the front of the engine, it is usually more trouble to change or get to. Vehicles that I have changed them on usually run about $50-$65 but are fairly easy to replace by someone at home. Good Luck