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The second set seems to show the AFR's are off quite a bit compared to the first graphs.
I would look in that area - O2 sensor, fuel pressure or fuel regulator, fuel filter. The readings in the second set of graphs seem to show more lean conditions than the first set.
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Emery
1988 930 coupe - Silver Metallic
TurboKraft 3.3L 8:1 CR, SuperSC Cams, GT35R, B&B Headers, TK intercooler, Tial WG, ARP, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ... 
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