Sounds like timing belt
I have a Kia Optima 2004, if you timing belt breaks be prepared to also replace a small balance belt that's inside the timing belt area and it also may have caused the camshaft-sensor to go out as well.
It happened to me. it was a bad Camshaft-Sensor. The new sensor needs to be position with a special tool that just kia dealer has. if not position correct it will destroy your engine.
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