Quote:
Originally Posted by humfrz
Hello Schweiz and welcome to the forum - 
Does your car have any power mods?
Are you sure the A/C compressor is not cycling, causing the idle to vary?
You might try putting your voltmeter on the battery when the car is running to see if their is any correlation between when the alternator is charging and the idle is fluctuating.
Did you get your last tank of gas where you normally do?
I doubt the ECU is still learning after the battery change, but, maybe it's a slow learner - 
I hope you get it sorted out.
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The car is bone stock and I've made sure the A/C compressor was not cycling. In fact, it will do this idle issue with the A/C on and off.
I got my last tank of gas at the exact same spot as last time.
Whats strange is that it seems like this may have started up again
after the ECU was done learning.