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My 2000 gls doesn't always keep a steady idol when the ac is on.If you leave the car parked with the a/c on,you will here the engine as if someone was sitting inside playing with the revs.The bounce in rpm is not very big,it goes up and douwn from about 800 rpm to 1100 all alone,the problem is these little spiks are consecutive.This is very anoying and i have no clue why this is happening does anybody have an idea what's happening?My car has 40k could this be a weak battery?
 

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I've noticed a bit of roughness in my idle as well when the AC is on too (and my car has ALWAYS had a ROCK-SOLID idle, even at 100,000 miles).

I think a new set of triple electrode boschs are in my cars future.
 
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