[eschaider]

If you have electircal supply issues, fuel delivery issues, sensor related issues or any of a myriad of others, data logging the interesting signal during an engine misbehavior event will immediately tell you what is going on with that particular system. If it is misbhaving then you will know where to look for gremlins. If it is not misbehaving it tells you the problem is elsewhere and may even point you in the direction you need to go depending on what other signals you were watching at the time.