what is killing the ignition coil,i have changed up to four since january on 1999 Nissan Quest

the ignition coil have been developing faults and i have changed up to four since january.while driving the car would suddenly stopped on the highway and would refused to start.but once the coil is replaced it would start.kindly tell me where the fault lies.thanks

Asked by for the 1999 Nissan Quest
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