It is the end of March, and temps are climbing into the 90s here in sunny Florida. I'll always be one to drive windows down, but most of my driving is highway and it's not practical. If I leave my a/c on after getting off, the rpms will drop suddenly then even out, over and over. It hasn't stalled out, but the unpredictable up and down worries me, considering it will be running a lot for the next 9 months or so. Any ideas?