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Hello, my name is***** this only occurs when the AC is on then that is because it puts an extra load on the engine. This can be caused by the AC system being overcharged or it can be low power from the engine. If there is a vacuum leak then that will cause the vent issue as well as a power issue. Most of the time the vacuum line will go into the firewall on the passenger side under the hood. you need to check these hoses and see if one of them has failed or see if the little plastic one way check valve is bad that is inline with the vacuum hose. I would also clean out the air flow meter as that gets dirty on this vehicle and will cause this hesitation. I hope this helps. Please let me know if you need anything else.