Wolf
After going back and rereading this thread I see you car is a 1998.
I believe your car has an "idle air control valve" as part of the throttle body.
Perhaps there is an issue with it that relates so the bog problem and the issue with the AC on when stopping.
I am not familiar with the setup so I can't be of much help.
I would do a search here on the forum and a general search on the "net".
I would scan you OBDII for codes or pending codes if the CEL has not set.
Then do some research and learn what you can about idle control valve issues.
I am not saying there is an issue with it just pointing out something to look at
