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First of all, my Fiero started having problems I started having cranking problems... battery kept dying for no good reason.

If you haven't found the problem with the Fiero yet, look for a short near the right hand(if memory serves) side of the motor near the trunk. I had an new 85 years ago, this seemed to be prevalent, because they found it so fast. Your symptoms sound the same as mine were at the time. Good luck.
Mike