Could this be just needing new spark plugs?
My car has 102000 miles.
My car has an automatic transmission.
Hey there. A proper diagnosis at a repair shop is the only way to be certain. If the spark plugs have not been changed in 40,000 miles or more, the car would benefit from replacing them. But any number of things can be causing your issue including bad plug wires, bad ignition coil(s), or poor fuel pressure caused by a bad fuel pump or regulator. There could also be mechanical issues with the engine. To have this checked, a certified technician from YourMechanic can come to your car's location to inspect the hesitation and idling issues to have them addressed.
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