It's quite possibly the battery.
Failing that search for an intermittent vacuum leak -- the unmetered air will cause you to skew lean at idle; ECU will compensate with high positive fuel trim, run rich, and dip a bit as it attempts to work around the leak.
So much of the throttle on this car is done with VVEL, I doubt cleaning the TB's will fix. Probably not it.
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Enjoy it. Destroy it.
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