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There are several reasons why your car is experiencing this problem, I could be a bad mass airflow sensor, bad DME, clogged catalytic converter, bad fuel pressure regulator, or bad fuel pump. Each if these would take a bit of explanation.

I'd recommend that you buy a Bentley manual for this vehicle, and follow the diagnostics for each of these possibilities.

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Q: How can you fix your 750il BMW it would not rev up?
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