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Its kind of hard to say i felt the exact same things, but i had some funny idle issues myself. Turns out my #2 injector was leaking and when i would turn the car off for >10 but <20min, i would occasionally get a stumbling startup and even long cranks, which made me think it was the HPFP. BMW dealer had it for a week and they replaced all 6 injectors and plugs. According to the invoice, they plug was soaked with fuel and the other plugs in bank1 were also fouled up.
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