Tuning my AEM without a Dyno

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For preliminary tuning I am not using a dyno. I would Appreciate any input on techniques others have had luck with on holding steady load and RPM. Any help on tuning techniques would be greatly appreciated. I did some low load tuning on the street, but found that the O2 feedback values change slightly due to my inability to hold RPM and LOAD steady. Should I just average this value across time and use that to change the main fuel map??? Thanks in advance