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2011 BMW 535i. I as well have the P0171 code with several cylinder misfires. On a cold start my car sounds smooth. But when the engine has warmed up and I start the engine there is a extremely loud and high pitch noise that shows up. It rough idles with the rpm going up and down around 1000rpm. Feels like the car is reving itself. But when I rev the engine up to 3000 rpm the sound goes away and it idles smoothly. Anyone have any ideas?
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