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You have something bleeding off your fuel pressure. I had similar symptoms on a N55 powered X3 and it turned out to be a leaking injector. No codes, normal power. Found it by pulling plugs and inspecting each cylinder and plugs for signs of wet fueling. It was blantanly obvious when I got to cylinder 4 as the plug was soaked. Change it and calibrated the new injector offset with ISTA and all is well. Suggest checking why you are losing pressure.
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