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Best to get a logging suite and see if STFT is running grossly negative over -10% and if AFR fails to go full lean when letting off throttle.
Symptoms do sound like leaking injectors and residual fuel burn off on start.
No real harm on pump gas if the DME is able to correct for the leak (small leak). But good practice to replace them with new index 12s from BMW if they're leaking.
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