I would have to look at that file on my pt (which I don't have because I am at work) but I suppose that when you started your car it was in open loop and surged. Then when it went into closed loop it settled down because it was running a 14.7 afr in closed loop.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)