It is most likely a misfire, especially if the engine light starts flashing. Most misfires are due to the secondary ignition system wearing out (spark plugs and wires). I would replace the spark plug wires first as they are the more common cause, but it's a good idea to replace the plugs too.
**Note - if the engine light is flashing, it indicates catalyst damage at that time. Driving a vehicle for prolonged periods with the engine misfiring will result in catalytic converter damage.
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