d16z6305civic

hey guys been a while since i been here hi to everyone and sorry if this is been posted before but is a emergency. Bought a civic 98 coupe auto with d16y7, everything works in the car specially AC but today had a problem was driving the car and it randomly shut off on me, i placed it on park tryed and cranked it and nutting tryed for at least 3 times, then i went into neutral cranked it and it stared right up car drives normally and everything went into a parking lot turned it off placed it on park and tryed again and it stared normally WTF could this be thank you.