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Have you tried different gas brands and/or stations?
I had the same problem as you with an otherwise stock car, AM dropping and staying at around .4 or .5 running OFT stage 1. It would start dropping slowly almost immediately after flashing (resets to 1.0) and going for a drive. Switching from my local Chevron to Mobil has kept it at 1.0 for the past few days, gonna keep my eye on it.
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