I have a 83 GSL 12A with 58K miles and runs great except when I turn on the AC it will stall. Any ideas? Thanks

 

welcome to the board.

if you still have your rat's nest in place, then my first thought is the A/C solenoid.

https://www.flickr.com/photos/knowprose/7760746326
if you need reference material, then you can get a copy of the FSM from here: Foxed.ca

 

That was my thought. Going to clean the contacts on it and replace the vacuum hose.