My car is hesitating periodically while driving.
If your vehicle has a Check Engine light, I would recommend starting there. Any trouble codes found in the system would likely be related to your issue, and would aid in diagnosis of this issue. Some possible causes of your issue would include a vacuum leak, an intermittently faulty ignition coil or fuel injector, a faulty spark plug, or even a weak fuel pump. I would recommend having a certified mechanic inspect your fuel and ignition systems after scanning your car for any trouble codes to find the source of your problem.
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