Hrm couple things to check:
1) how old is the battery? If it's older than about 3-5 years it's time to replace.
2) checked spark plugs recently? I usually change them out every year since they are cheap.
3) check the spark plug wires and the jackets for cracks?
4) how old it is the alternator?
5) Did you try unplugging your battery negative terminal to reset the ECU?
6) does it do it all the time?
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