Hi. Currently i am running a 2002 ecotec 5 speed cavalier. I am having problems with tuning. I have not been at 20 psi for long. At 15 psi a/f stayed very well. Now that i am at 20 it is a nice 10.5 all the way up to 3800 rpms. then it goes to 12.5 for about 2 seconds then right back down to 10.5. I have looked through the tune and i do not see anything that would cause this. Before i start fooling around maybe someone could help me out. I am willing to listen and to change anything that i have wrong so please dont flame me. thanks alot. Also 650cc injec.
Tune listed on hp tuners website

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P&P Tuning
420.5whp / 359.8wtq