I replaced my battery and the car feels and runs noticeably better. I noticed my voltmeter was reading low when i was working on some electronic wiring in my car, and on a whim, I just went and replaced the battery since I don't remember when the last time it was changed. The car not only idles better, but other things like the fuel-trims are more in-line. I wonder if a worn battery with wonky voltages can affect the car? Seems plausible, especially since my car is now reliant on reliable voltage supply stuff like the ethanol sensor.
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