Irregular revs when electricity needed
I'm having a problem of my revs dropping at idling and having to shoot back up again (irregular idle) when I switch on anything electric-hungry in my car.
Stuff like switching to a higher air-con fan speed, wipers, high beam, stereo etc will all cause my idle revs to drop and the engine will automatically compensate by revving up. Never happened before...
What could be wrong? I've checked the battery voltage when the car is running and not, and its more than adequate(14.5V, 13.5V)
The irregular idle is driving me crazy!