Rpm bounces while moving

[Chamberpains]

That screenshot isn't showing to much. It caught your RPM's dropping to 635 which may be a slight drop but that is within normal fluctuations. But it also could be explained by the .07 volt drop on the Accelerator Signal voltage. There is nothing definitive that I see.

Try the 20 milsec graphical recording on the Accelerator signal voltage and your RPM at the same time. See if it'll catch your event and maybe the 2 will drop at the same time.