Mine does the same after replacing a faulty IBS connecting cable without battery replacement.
It idles lower now and randomly revs up to about 800 at the stoplight (without touching anything), then goes back to ~550. Clutch in makes it go up too.
I cleaned my ICV this summer so I don't thihk that's the cause. The idle is very stable, no fluctuations.
Should I reset battery adaptations after I have installed a new IBS cable which got rid of IBS fault codes?
On a side note, with Vibra technics engine mounts the vibration is much more pronounced now when the idle dropped to 550 (before I was usually at about 700).
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