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I had the Similar problem on an M103...checked sensors/swapped modules/EHA etc, etc.. Turned out to be an O2 sensor.. One Mustang sensor later everything was A Ok...A/F ratio's right back where they should be.
For a reference, we were getting 14.3-14.8 @ WOT and 12.9-13.1 @ steady state cruising, high 14's low 15's @ idle.
I'll be curious to hear how you make out.
Jonathan
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