It might help to do some parameter monitoring and/or logging.
You can find cheap ($20-40) ODB/CAN-to-USB convertors on the Intertubes and there are several free programs available. I have a page that lists/reviews some of the programs at the link in my sig.
If you have an Android device, there is an app called Torque available.
If you need to dig deeper than what the above can handle, one of the tuning apps would be an option.
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