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Thanks for all the help. Some of the things you've mentioned I haven't even come across in my reading. A friend of mine is doing the tuning, so no charge...lol.

I do go lean in between shifts...

I'm gonna keep this simple and I'll give you the "no B.S." down to business facts:

2006 Cobalt 2.0L SS/SC (LSJ)

Pertinent Mods:
>Intake
>ZZP Midlength Header/DP Combo (extra O2 Bung)
>GMPP...

Tried this on another forum, perhaps better luck on here:

In an attempt to combine all the information out there and narrow it down to a specific 4-cyl engine:

Hi,
Name's Tom. A little...