[nj85z28]

Ok so my brother bought a 95 LT1. When it was purchased we were told it would need an optispark replacement. After doing my homework for a week or so i swapped out the opti last night. I put everything back together and the car fired over for about 5 seconds and died. Today i came home from work and tried another battery because the other was dead, and the car fired over and died a few more times. does this sound like an optispark issue? we got the gm unit brand new and its an M6 car if that helps.