After data logging a couple of runs and slowing down the playback I noticed that the rpm seems to build but will drop maybe 50 then build again and then drop 50 build and so on it will only be for one frame each time. Also when it does this the injector duty cycle drops each time it drops the rpm. All this is under full throttle. I also remember seeing this on a Grand National I owned. Just wondering if anybody else has noticed this or do I have a problem?

 

I know this is an old thread but I just noticed while using Datamaster that my car does this as well. If you graph the RPM's the line will look jaged. Anyone know anything about this? Thanks