i put a z6 in my 88 hatch(car ran with no problems from the old motor before i took it out) and it didnt have spark at the msd box so i took a ls dizzy and it fired up but when i drive the cel flickers, there is no charge from the alternator no battery light on in the dash and its slow as ---- wtf

 

what ecu are you using?

 

grounds grounds grounds.