There are a few websites out there full of useful diagnostic info.
This is one site that Andrei (Cavalier 342)
felt would be useful.
https://everything2.com/title/How+to+re ... me+GM+cars
Thanks for the heads up Andrei.
Everyone knows websites like TopBuzz and contributors like Andy Kirwan.
Here is a link to TopBuzz.
http://www.topbuzz.co.uk
More info than you can shake a stick at.
Enjoy.