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You may need to tweak your OLFA table under Fuel>Open Loop/Closed Loop.

Add some fuel to it. Try these settings:

68 86 104 122 140 158...

He's setting the O2 proportional to the same as idle proportional. It may help.

This is a good starter guide for Speed Density tuning with a wideband:

http://www.hptuners.com/help/vcm_editor_tuning_how_to_user_sd.htm

There are a lot of tables you can mess with. My advice is to not touch a lot of them. Most setups don't need you screwing around with the stock GM parameters. If they do, then something else is...

Set your boundary at 6.5 or something straight across. But that's the least of your worries.

Tuning with the narrowbands would only work for cruising at idle. Any sort of PE is going to be way...