what are the major signs of a opti spark going bad, and how hard would it be to change it?

 

When you Opti starts going bad your car starts to sputter or pop---if it has gotten to that point. I had a cousin who had to replace it about 3 times. It is not difficult to install, you just remove the water pump and harmonic balancer--the opti only has 3 bolts too.

good source of info in: www.f-body.org
>>>>check the install and fix guide in the home page of the above---lots of helpful info with pictures.