I have a 99 crown vic that runs perfect except when the a/c or heat is on. When stopped it will idle high when the compressor kicks on. It almost seems like it wants to move when it kicks on. With it off the car idles just fine but with it on is another story. Every once in a while it will idle real high then stall out. The compressor is not old at all and it has been doing this for over a year. Any help on this problem would be appreciated.