98 Honda civic ex
I'm curious if during idle, it's normal for the rpms to fluctuate 10-15 rpms +/- or if it's supposed to always be steady constantly?
My OEM tach doesn't pick up this slight change so it looks steady there, but with my obd2 scan tool I can see it.
Is that normal? I've been trying to tackle a slight engine shake at idle but everyone's been telling me it's normal just want to get more opinions. Thanks