I know my engine is supposed to jump a little RPMs when my fans kick in for the AC, but latly when im at a stop light it jumps, and when i comes back down from the spike up it seems it wants to stall.. almost did when i was backing into a parking spot as i was turning the wheel... Took it in to the dealer a month ago because of the jump and they couldnt reproduce the jump in rpms. should i stop worring about it?