Kia Troubleshooting Questions? Ask a Mechanic
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Usually, the PCM will cut off injector pulse to two cylinders when it detects a problem with ABS or traction control. This could very well be the case with your Sorento. Have you had the chance to have the vehicle scanned by Kia or a qualified shop that has access to the factory scan tool? Are there any other symptoms, any warning lamps, etc?
Your best option at this time would be to plug in a dealer-level scan tool capable of showing all engine data. This would allow you to see what is happening as the engine warms up.