89 z6 civc

Ive had the mini me swap done for almost a year now and the odd time while ive been driving my car seems to shut off and and turn back on the rpm would drop to zero then back up at hwy speeds and then i was driving and it just died i have no spark at all i got a new cap and rotor and nothing im using the A6 dizzy on the Z6 head
should i replace dizzy?
or is there other things i could check first ?