Perhaps it is a vacuum leak? Vacuum leaks will cause the car to sound like it is going to stall or bog down a bit when idling. Vacuum leaks may also cause the car to idle higher due to the car having to work harder to force air through the motor.
Does your car start better in certain weather?
I would inspect any plastic pipes going into the motor as those are going to have to do with induction. PCV valves are a common culprit for issues like these.
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